test(skills): persist M2 cold adversarial stress test suites on main

- Group speedbar skills into dedicated horizontal rows by 1.13c ListRow/SkillPage categories:
  - Row 0: Universal actions (Attack 0, Throw 2, Unsummon 3, Left Hand Throw 4)
  - Rows 1..3: Class skill tree tabs (Tab 1, Tab 2, Tab 3)
  - Row 4: Item and charged skills (Townportal, Identify, charged items)
- Compact unlearned or empty tree rows contiguously without blank spacing
- Enforce strict 1.13c left-click filtering (83 active leftskill=1 skills; 26 passives and all auras excluded)
- Orient left popup upward-rightward and right popup upward-leftward with 800x600 canvas clamping
- Sort intra-row skills by reqlevel ascending then skillId ascending
- Add comprehensive 7-class parity test suite covering grouping, compaction, filtering, and geometry

src/ui/hotkeys.ts

@@ -27,6 +27,10 @@ export interface HotkeySkillEntry {
   readonly charges?: number
   readonly maxCharges?: number
   readonly cooldownMs?: number
+  readonly listRow?: number
+  readonly reqlevel?: number
+  readonly isItemSkill?: boolean
+  readonly tabIndex?: number
 }
 
 /**
@@ -78,17 +82,26 @@ export function isPassiveSkill(skillId: number): boolean {
  * Diablo II v1.13c Skills usable on the Left-Click action button (Skills.txt `leftskill = 1`).
  */
 export const LEFT_USABLE_SKILL_IDS: ReadonlySet<number> = new Set<number>([
-  0, 2, 6, 7, 10, 11, 12, 14, 15, 16, 19, 20, 21, 22, 24, 25, 26, 27, 30, 31, 34, 35,
-  36, 38, 39, 41, 45, 47, 49, 53, 55, 56, 59, 64,
+  // Universal actions (Attack 0, Throw 2, Left Hand Throw 4, Left Hand Swing 5)
+  0, 2, 4, 5,
+  // Amazon (20 active skills with leftskill = 1)
+  6, 7, 10, 11, 12, 14, 15, 16, 19, 20, 21, 22, 24, 25, 26, 27, 30, 31, 34, 35,
+  // Sorceress (10 active skills with leftskill = 1)
+  36, 38, 39, 41, 45, 47, 49, 53, 55, 64,
+  // Necromancer (4 active skills with leftskill = 1)
   67, 73, 84, 93,
+  // Paladin (9 active combat skills with leftskill = 1)
   96, 97, 101, 106, 107, 111, 112, 116, 121,
+  // Barbarian (10 active combat skills with leftskill = 1)
   126, 132, 133, 139, 140, 143, 144, 147, 151, 152,
-  225, 229, 230, 232, 238, 239, 240, 242, 243, 245, 248,
+  // Druid (12 active combat/elemental skills with leftskill = 1)
+  225, 229, 230, 232, 233, 238, 239, 240, 242, 243, 245, 248,
+  // Assassin (14 active martial/trap skills with leftskill = 1)
   251, 254, 255, 256, 257, 259, 260, 265, 266, 269, 270, 274, 275, 280,
 ])
 
 export function isLeftUsableSkill(skillId: number): boolean {
-  if (isPassiveSkill(skillId)) return false
+  if (isPassiveSkill(skillId) || isAuraSkill(skillId)) return false
   return LEFT_USABLE_SKILL_IDS.has(skillId)
 }
 
@@ -182,6 +195,42 @@ export function resolveSkillIcon(skillId: number, hasWeapon = true): SkillIconMa
       atlasRect: { x: 192, y: 0, width: 48, height: 48, w: 48, h: 48 },
     }
   }
+  if (skillId === 4) {
+    return {
+      skillId: 4,
+      name: 'Left Hand Throw',
+      iconPath: '/skills/icon_4.png',
+      isGeneric: true,
+      dc6Path: 'data/global/ui/SPELLS/Skillicon.DC6',
+      dc6Source: 'data/global/ui/SPELLS/Skillicon.DC6',
+      frameIndex: 12,
+      atlasRect: { x: 576, y: 0, width: 48, height: 48, w: 48, h: 48 },
+    }
+  }
+  if (skillId === 217 || skillId === 218) {
+    return {
+      skillId,
+      name: skillId === 217 ? 'Scroll of Identify' : 'Book of Identify',
+      iconPath: `/skills/icon_${skillId}.png`,
+      isGeneric: true,
+      dc6Path: 'data/global/ui/SPELLS/Skillicon.DC6',
+      dc6Source: 'data/global/ui/SPELLS/Skillicon.DC6',
+      frameIndex: 14,
+      atlasRect: { x: 672, y: 0, width: 48, height: 48, w: 48, h: 48 },
+    }
+  }
+  if (skillId === 219 || skillId === 220) {
+    return {
+      skillId,
+      name: skillId === 219 ? 'Scroll of Townportal' : 'Book of Townportal',
+      iconPath: `/skills/icon_${skillId}.png`,
+      isGeneric: true,
+      dc6Path: 'data/global/ui/SPELLS/Skillicon.DC6',
+      dc6Source: 'data/global/ui/SPELLS/Skillicon.DC6',
+      frameIndex: 18,
+      atlasRect: { x: 864, y: 0, width: 48, height: 48, w: 48, h: 48 },
+    }
+  }
   return {
     skillId,
     name: `Skill ${skillId}`,
@@ -194,24 +243,78 @@ export function resolveSkillIcon(skillId: number, hasWeapon = true): SkillIconMa
   }
 }
 
+/**
+ * Resolves authentic 1.13c ListRow for Speedbar popup (0..4).
+ * Row 0 (bottom): Basic universal actions (Attack 0, Throw 2, Unsummon 3, etc.)
+ * Rows 1..3: Character skill tree tabs (Tab 1 -> ListRow 1, Tab 2 -> ListRow 2, Tab 3 -> ListRow 3)
+ * Row 4 (top): Item skills (Scrolls/Books of TP & ID, or items marked as item skills)
+ */
+export function getSkillListRow(skill: HotkeySkillEntry): number {
+  if (typeof (skill as any).listRow === 'number') {
+    return (skill as any).listRow
+  }
+  const id = skill.skillId
+  // 1. Item skills (Scrolls/Books of TP & ID, charged items, or marked as item skills)
+  if (id === 217 || id === 218 || id === 219 || id === 220 || (skill as any).isItemSkill || skill.charges !== undefined) {
+    return 4
+  }
+  // 2. Universal / basic actions
+  if (id === 0 || id === 1 || id === 2 || id === 3 || id === 4 || id === 5 || id === 350 || (skill as any).isGeneric) {
+    return 0
+  }
+  // 3. Class skill tree tabs (Tab 1 -> ListRow 1, Tab 2 -> ListRow 2, Tab 3 -> ListRow 3)
+  const catalogEntry = SKILLS_BY_ID[id]
+  if (catalogEntry) {
+    return catalogEntry.tabIndex + 1
+  }
+  if (typeof (skill as any).tabIndex === 'number') {
+    return (skill as any).tabIndex + 1
+  }
+  return 0
+}
+
+/**
+ * Resolves requirement level (reqlevel) for intra-row sorting in Speedbar popup.
+ */
+export function getSkillReqLevel(skill: HotkeySkillEntry): number {
+  if (typeof (skill as any).reqlevel === 'number') {
+    return (skill as any).reqlevel
+  }
+  const catalogEntry = SKILLS_BY_ID[skill.skillId]
+  if (catalogEntry && typeof catalogEntry.reqlevel === 'number') {
+    return catalogEntry.reqlevel
+  }
+  return 1
+}
+
 export function getAvailableSkillsForSide(
   side: 'left' | 'right',
   skills: readonly HotkeySkillEntry[] = DEFAULT_SORCERESS_SKILLS,
 ): readonly HotkeySkillEntry[] {
   return skills.filter(s => {
     if (isPassiveSkill(s.skillId) || s.isPassive) return false
-    return side === 'left' ? s.leftUsable : s.rightUsable
+    if (side === 'left') {
+      if (isAuraSkill(s.skillId) || s.isAura) return false
+      if (!isLeftUsableSkill(s.skillId)) return false
+      return s.leftUsable !== false
+    } else {
+      return s.rightUsable !== false
+    }
   })
 }
 
 export const LEFT_SKILL_BOUNDS = { x: 117, y: 551, width: 48, height: 48 } as const
 export const RIGHT_SKILL_BOUNDS = { x: 635, y: 551, width: 48, height: 48 } as const
 
-export const DEFAULT_SORCERESS_SKILLS: readonly HotkeySkillEntry[] = [
-  // Universal Skills
+export const DEFAULT_UNIVERSAL_SKILLS: readonly HotkeySkillEntry[] = [
   { skillId: 0, name: 'Attack', nameZh: '普通攻击', level: 1, manaCost: 0, leftUsable: true, rightUsable: true },
   { skillId: 2, name: 'Throw', nameZh: '投掷', level: 1, manaCost: 0, leftUsable: true, rightUsable: true },
   { skillId: 3, name: 'Unsummon', nameZh: '取消召唤', level: 1, manaCost: 0, leftUsable: false, rightUsable: true },
+]
+
+export const DEFAULT_SORCERESS_SKILLS: readonly HotkeySkillEntry[] = [
+  // Universal Skills
+  ...DEFAULT_UNIVERSAL_SKILLS,
   // Fire Spells (8 active)
   { skillId: 36, name: 'Fire Bolt', nameZh: '火弹', level: 5, manaCost: 2.5, leftUsable: true, rightUsable: true },
   { skillId: 41, name: 'Inferno', nameZh: '地狱之火', level: 1, manaCost: 0.6, leftUsable: true, rightUsable: true },
@@ -219,7 +322,7 @@ export const DEFAULT_SORCERESS_SKILLS: readonly HotkeySkillEntry[] = [
   { skillId: 47, name: 'Fire Ball', nameZh: '火球', level: 8, manaCost: 8.5, leftUsable: true, rightUsable: true },
   { skillId: 51, name: 'Fire Wall', nameZh: '火墙', level: 1, manaCost: 22, leftUsable: false, rightUsable: true },
   { skillId: 52, name: 'Enchant', nameZh: '强化', level: 1, manaCost: 25, leftUsable: false, rightUsable: true },
-  { skillId: 56, name: 'Meteor', nameZh: '陨石', level: 6, manaCost: 22, leftUsable: true, rightUsable: true },
+  { skillId: 56, name: 'Meteor', nameZh: '陨石', level: 6, manaCost: 22, leftUsable: false, rightUsable: true },
   { skillId: 62, name: 'Hydra', nameZh: '九头海蛇', level: 1, manaCost: 20, leftUsable: false, rightUsable: true },
   // Lightning Spells (9 active)
   { skillId: 38, name: 'Charged Bolt', nameZh: '充能弹', level: 4, manaCost: 4, leftUsable: true, rightUsable: true },
@@ -238,7 +341,7 @@ export const DEFAULT_SORCERESS_SKILLS: readonly HotkeySkillEntry[] = [
   { skillId: 45, name: 'Ice Blast', nameZh: '冰风暴', level: 5, manaCost: 8, leftUsable: true, rightUsable: true },
   { skillId: 50, name: 'Shiver Armor', nameZh: '碎冰甲', level: 1, manaCost: 11, leftUsable: false, rightUsable: true },
   { skillId: 55, name: 'Glacial Spike', nameZh: '冰尖柱', level: 10, manaCost: 14.5, leftUsable: true, rightUsable: true },
-  { skillId: 59, name: 'Blizzard', nameZh: '暴风雪', level: 10, manaCost: 27, leftUsable: true, rightUsable: true },
+  { skillId: 59, name: 'Blizzard', nameZh: '暴风雪', level: 10, manaCost: 27, leftUsable: false, rightUsable: true },
   { skillId: 60, name: 'Chilling Armor', nameZh: '寒冰装甲', level: 1, manaCost: 17, leftUsable: false, rightUsable: true },
   { skillId: 64, name: 'Frozen Orb', nameZh: '冰封球', level: 12, manaCost: 30, leftUsable: true, rightUsable: true },
 ]
@@ -377,8 +480,12 @@ export class SkillHotkeysHud {
   ): void {
     // Passive skills strictly cannot enter the quickbar
     this.availableSkills = skills.filter(s => !isPassiveSkill(s.skillId) && !s.isPassive)
-    if (defaultLeft !== undefined && !isPassiveSkill(defaultLeft)) this.leftSkillId = defaultLeft
-    if (defaultRight !== undefined && !isPassiveSkill(defaultRight)) this.rightSkillId = defaultRight
+    if (defaultLeft !== undefined && isLeftUsableSkill(defaultLeft) && !isAuraSkill(defaultLeft)) {
+      this.leftSkillId = defaultLeft
+    }
+    if (defaultRight !== undefined && !isPassiveSkill(defaultRight)) {
+      this.rightSkillId = defaultRight
+    }
     this.preloadSkillIcons()
   }
 
@@ -428,23 +535,24 @@ export class SkillHotkeysHud {
 
   assignSkill(side: 'left' | 'right', skillId: number): boolean {
     if (isPassiveSkill(skillId)) return false
-    if (side === 'left') this.leftSkillId = skillId
-    else this.rightSkillId = skillId
+    if (side === 'left') {
+      if (isAuraSkill(skillId) || !isLeftUsableSkill(skillId)) return false
+      this.leftSkillId = skillId
+    } else {
+      this.rightSkillId = skillId
+    }
     return true
   }
 
   setDualSkill(skillId: number): boolean {
-    if (isPassiveSkill(skillId)) return false
+    if (isPassiveSkill(skillId) || isAuraSkill(skillId) || !isLeftUsableSkill(skillId)) return false
     this.leftSkillId = skillId
     this.rightSkillId = skillId
     return true
   }
 
   getAvailableSkillsForSide(side: 'left' | 'right'): readonly HotkeySkillEntry[] {
-    return this.availableSkills.filter(s => {
-      if (isPassiveSkill(s.skillId) || s.isPassive) return false
-      return side === 'left' ? s.leftUsable : s.rightUsable
-    })
+    return getAvailableSkillsForSide(side, this.availableSkills)
   }
 
   triggerFunctionKey(fKey: string): { side: 'left' | 'right'; skillId: number } | null {
@@ -455,8 +563,15 @@ export class SkillHotkeysHud {
     }
     const bound = this.bindings.get(key)
     if (!bound) return null
-    if (bound.side === 'left') this.leftSkillId = bound.skillId
-    else this.rightSkillId = bound.skillId
+    if (bound.side === 'left') {
+      if (isLeftUsableSkill(bound.skillId) && !isAuraSkill(bound.skillId)) {
+        this.leftSkillId = bound.skillId
+      }
+    } else {
+      if (!isPassiveSkill(bound.skillId)) {
+        this.rightSkillId = bound.skillId
+      }
+    }
     return bound
   }
 
@@ -466,19 +581,74 @@ export class SkillHotkeysHud {
     y: number
     w: number
     h: number
+    listRow: number
+    visualRow: number
+    col: number
   }[] {
     const list = this.getAvailableSkillsForSide(side)
-    const cols = 5
     const cellW = 48
     const cellH = 48
     const base = side === 'left' ? LEFT_SKILL_BOUNDS : RIGHT_SKILL_BOUNDS
-    return list.map((skill, idx) => {
-      const col = idx % cols
-      const row = Math.floor(idx / cols)
-      const x = side === 'left' ? base.x + col * cellW : base.x - col * cellW
-      const y = base.y - (row + 1) * cellH - 6
-      return { skill, x, y, w: cellW, h: cellH }
+
+    // 1. Group available skills by authentic ListRow (0..4)
+    const rowMap = new Map<number, HotkeySkillEntry[]>()
+    for (const skill of list) {
+      const explicitCharges = this.getSkillCharges(skill.skillId)
+      const effectiveSkill = (explicitCharges !== undefined && skill.charges === undefined)
+        ? { ...skill, charges: explicitCharges }
+        : skill
+      const row = getSkillListRow(effectiveSkill)
+      let group = rowMap.get(row)
+      if (!group) {
+        group = []
+        rowMap.set(row, group)
+      }
+      group.push(effectiveSkill)
+    }
+
+    // 2. Intra-row ordering: sort each row by reqlevel ascending, then skillId ascending
+    for (const group of rowMap.values()) {
+      group.sort((a, b) => {
+        const reqA = getSkillReqLevel(a)
+        const reqB = getSkillReqLevel(b)
+        if (reqA !== reqB) return reqA - reqB
+        return a.skillId - b.skillId
+      })
+    }
+
+    // 3. Compaction: only consider rows with >= 1 skill, ordered from bottom (Row 0) to top (Row 4)
+    // Row 0: Basic actions (bottom, closest to slot)
+    // Rows 1..3: Class skill tree tabs
+    // Row 4: Item skills (top)
+    // Unlearned or inactive rows are compacted without blank gaps
+    const populatedRows = Array.from(rowMap.keys())
+      .filter(r => (rowMap.get(r)?.length ?? 0) > 0)
+      .sort((a, b) => a - b)
+
+    const cells: {
+      skill: HotkeySkillEntry
+      x: number
+      y: number
+      w: number
+      h: number
+      listRow: number
+      visualRow: number
+      col: number
+    }[] = []
+
+    populatedRows.forEach((listRow, visualRow) => {
+      const skillsInRow = rowMap.get(listRow)!
+      skillsInRow.forEach((skill, col) => {
+        const rawX = side === 'left' ? base.x + col * cellW : base.x - col * cellW
+        const rawY = base.y - (visualRow + 1) * cellH - 6
+        // Clamp strictly within 800x600 viewport canvas bounds
+        const x = Math.max(0, Math.min(800 - cellW, rawX))
+        const y = Math.max(0, Math.min(600 - cellH, rawY))
+        cells.push({ skill, x, y, w: cellW, h: cellH, listRow, visualRow, col })
+      })
     })
+
+    return cells
   }
 
   getSpeedbarSkills(side: 'left' | 'right'): {
@@ -487,6 +657,9 @@ export class SkillHotkeysHud {
     y: number
     w: number
     h: number
+    listRow: number
+    visualRow: number
+    col: number
   }[] {
     return this.getPopupCells(side)
   }
@@ -536,8 +709,15 @@ export class SkillHotkeysHud {
       const cells = this.getPopupCells(this.openPopup)
       for (const c of cells) {
         if (logicalX >= c.x && logicalX <= c.x + c.w && logicalY >= c.y && logicalY <= c.y + c.h) {
-          if (this.openPopup === 'left') this.leftSkillId = c.skill.skillId
-          else this.rightSkillId = c.skill.skillId
+          if (this.openPopup === 'left') {
+            if (isLeftUsableSkill(c.skill.skillId) && !isAuraSkill(c.skill.skillId)) {
+              this.leftSkillId = c.skill.skillId
+            }
+          } else {
+            if (!isPassiveSkill(c.skill.skillId)) {
+              this.rightSkillId = c.skill.skillId
+            }
+          }
           this.openPopup = null
           return true
         }
@@ -664,6 +844,36 @@ export class SkillHotkeysHud {
         ctx.fillStyle = side === 'left' ? '#5c2818' : '#182c5c'
         ctx.fillRect(x + 2, y + 2, 44, 44)
       }
+    } else if (skillId === 4) {
+      const icon = this.iconImages.get(4)
+      if (icon && icon.complete && icon.naturalWidth > 0) {
+        ctx.drawImage(icon, x, y, 48, 48)
+      } else if (genericSkillsImg && genericSkillsImg.complete && genericSkillsImg.naturalWidth > 0) {
+        ctx.drawImage(genericSkillsImg, 12 * 48, 0, 48, 48, x, y, 48, 48)
+      } else {
+        ctx.fillStyle = side === 'left' ? '#5c2818' : '#182c5c'
+        ctx.fillRect(x + 2, y + 2, 44, 44)
+      }
+    } else if (skillId === 217 || skillId === 218) {
+      const icon = this.iconImages.get(skillId)
+      if (icon && icon.complete && icon.naturalWidth > 0) {
+        ctx.drawImage(icon, x, y, 48, 48)
+      } else if (genericSkillsImg && genericSkillsImg.complete && genericSkillsImg.naturalWidth > 0) {
+        ctx.drawImage(genericSkillsImg, 14 * 48, 0, 48, 48, x, y, 48, 48)
+      } else {
+        ctx.fillStyle = side === 'left' ? '#5c2818' : '#182c5c'
+        ctx.fillRect(x + 2, y + 2, 44, 44)
+      }
+    } else if (skillId === 219 || skillId === 220) {
+      const icon = this.iconImages.get(skillId)
+      if (icon && icon.complete && icon.naturalWidth > 0) {
+        ctx.drawImage(icon, x, y, 48, 48)
+      } else if (genericSkillsImg && genericSkillsImg.complete && genericSkillsImg.naturalWidth > 0) {
+        ctx.drawImage(genericSkillsImg, 18 * 48, 0, 48, 48, x, y, 48, 48)
+      } else {
+        ctx.fillStyle = side === 'left' ? '#5c2818' : '#182c5c'
+        ctx.fillRect(x + 2, y + 2, 44, 44)
+      }
     } else {
       const icon = this.iconImages.get(skillId)
       if (icon && icon.complete && icon.naturalWidth > 0) {
@@ -841,6 +1051,128 @@ export class SkillHotkeysHud {
       return lines
     }
 
+    if (skillId === 4) {
+      lines.push({
+        text: '左手投掷 (Left Hand Throw)',
+        color: 'gold',
+        font: 'fontexocet10',
+        align: 'center',
+      })
+      const boundKey = this.getHotkeyLabelForSkill(side, skillId)
+      if (isSpeedbar) {
+        lines.push({
+          text: boundKey ? `当前快捷键: ${boundKey} (按 F1-F8 键重新绑定)` : '按 F1-F8 键设置快捷键',
+          color: 'tan',
+          font: 'font8',
+          align: 'center',
+        })
+      } else if (boundKey) {
+        lines.push({
+          text: `快捷键: ${boundKey}`,
+          color: 'tan',
+          font: 'font8',
+          align: 'center',
+        })
+      }
+      lines.push({
+        text: '使用副手投掷当前装备的投掷类武器。',
+        color: 'white',
+        font: 'font8',
+        align: 'center',
+      })
+      lines.push({
+        text: '法力消耗: 0',
+        color: 'white',
+        font: 'font8',
+        align: 'center',
+      })
+      return lines
+    }
+
+    if (skillId === 217 || skillId === 218) {
+      const isBook = skillId === 218
+      lines.push({
+        text: isBook ? '辨识之书 (Tome of Identify)' : '辨识卷轴 (Scroll of Identify)',
+        color: 'gold',
+        font: 'fontexocet10',
+        align: 'center',
+      })
+      const boundKey = this.getHotkeyLabelForSkill(side, skillId)
+      if (isSpeedbar) {
+        lines.push({
+          text: boundKey ? `当前快捷键: ${boundKey} (按 F1-F8 键重新绑定)` : '按 F1-F8 键设置快捷键',
+          color: 'tan',
+          font: 'font8',
+          align: 'center',
+        })
+      } else if (boundKey) {
+        lines.push({
+          text: `快捷键: ${boundKey}`,
+          color: 'tan',
+          font: 'font8',
+          align: 'center',
+        })
+      }
+      lines.push({
+        text: '使用后辨识未鉴定的魔法、稀有或暗金物品。',
+        color: 'white',
+        font: 'font8',
+        align: 'center',
+      })
+      const charges = this.getSkillCharges(skillId)
+      if (charges !== undefined) {
+        lines.push({
+          text: `数量: ${charges}`,
+          color: charges > 0 ? 'white' : 'red',
+          font: 'font8',
+          align: 'center',
+        })
+      }
+      return lines
+    }
+
+    if (skillId === 219 || skillId === 220) {
+      const isBook = skillId === 220
+      lines.push({
+        text: isBook ? '城镇传送之书 (Tome of Town Portal)' : '城镇传送卷轴 (Scroll of Town Portal)',
+        color: 'gold',
+        font: 'fontexocet10',
+        align: 'center',
+      })
+      const boundKey = this.getHotkeyLabelForSkill(side, skillId)
+      if (isSpeedbar) {
+        lines.push({
+          text: boundKey ? `当前快捷键: ${boundKey} (按 F1-F8 键重新绑定)` : '按 F1-F8 键设置快捷键',
+          color: 'tan',
+          font: 'font8',
+          align: 'center',
+        })
+      } else if (boundKey) {
+        lines.push({
+          text: `快捷键: ${boundKey}`,
+          color: 'tan',
+          font: 'font8',
+          align: 'center',
+        })
+      }
+      lines.push({
+        text: '打开一个通往最近城镇的安全蓝色传送门。',
+        color: 'white',
+        font: 'font8',
+        align: 'center',
+      })
+      const charges = this.getSkillCharges(skillId)
+      if (charges !== undefined) {
+        lines.push({
+          text: `数量: ${charges}`,
+          color: charges > 0 ? 'white' : 'red',
+          font: 'font8',
+          align: 'center',
+        })
+      }
+      return lines
+    }
+
     // 2. Class Skills
     const vm = this.tooltipResolver ? this.tooltipResolver(skillId) : null
     const entry = this.availableSkills.find(s => s.skillId === skillId)

tests/hotkeys.test.ts

@@ -233,6 +233,13 @@ describe('SkillHotkeysHud & Dual Slot Mechanics', () => {
     hud.draw(ctx, mockAtlas, mockFont, true)
     const unsummonDraw = drawImageCalls.find((c) => c[0] === mockAtlas && c[1] === 192)
     expect(unsummonDraw).toBeDefined()
+
+    // 5. Left Hand Throw (skill 4): should draw left hand throw (sx = 576, frame 12)
+    hud.leftSkillId = 4
+    drawImageCalls.length = 0
+    hud.draw(ctx, mockAtlas, mockFont, true)
+    const leftHandThrowDraw = drawImageCalls.find((c) => c[0] === mockAtlas && c[1] === 576)
+    expect(leftHandThrowDraw).toBeDefined()
   })
 
   it('allows binding Throw to left/right slot and Unsummon to right slot only (Issue #376)', () => {

tests/skills/sor/adv-cold-m2-aoe-stress.test.ts

@@ -0,0 +1,819 @@
+/**
+ * Adversarial Stress & Boundary Testing Suite — Milestone 2: Cold Projectiles & Cold Mastery
+ * Commit: 375f329
+ *
+ * Focus Areas:
+ * 1. Glacial Spike 64px (4 subtiles) Radial Burst Boundary Verification:
+ *    - Distance boundary sweeps: 0px, 30px, 63px, 64px, 64.1px, 65px, 80px, 128px.
+ *    - Strict inequality validation: units at <= 64px receive full cold damage & solid freeze;
+ *      units at > 64px receive 0 splash damage and 0 freeze.
+ *    - Multi-directional radial boundary test across 8 compass axes (0°, 45°, 90°, ..., 315°).
+ * 2. Obstacle & Wall Collision Detonation:
+ *    - Collision against terrain obstacle (COLLIDE_WALL).
+ *    - Immediate detonation at impact coordinates (hitWallX, hitWallY).
+ *    - Submissile ejection verification: 'glacialspikeejecta' and explosion missile spawned.
+ *    - 64px AoE burst applied to adjacent units from the wall impact point.
+ * 3. Freeze Application & Immunity:
+ *    - Cannot Be Frozen (cannot_be_frozen > 0): receives cold damage, but freeze state is skipped.
+ *    - Cold Immunity (coldresist >= 100): 0 damage, freeze state is skipped, immune flag set.
+ *    - Standard targets: receive cold damage and 'freeze' state.
+ * 4. Cold Mastery Resistance Sweeps (-100% to +200% against slvl 1 to 50):
+ *    - Systematic sweep of base cold resistance across [-100%, +200%] vs slvl 1..50.
+ *    - Natural immunity rule: Cold Mastery alone NEVER pierces cold immune targets (res >= 100%).
+ *    - Broken immunity rule: when Conviction/Lower Resist reduces res < 100%, Cold Mastery applies at full power.
+ *    - Strict -100% floor clamp: effective resistance never drops below -100% (max 2.0x multiplier).
+ *    - Differential fuzzing against brute-force mathematical oracle (1000 randomized iterations).
+ */
+
+import { describe, expect, it } from 'vitest'
+import { getSharedDataRegistry } from '../../../src/game/engine/data-registry.ts'
+import { UnitStatList } from '../../../src/game/engine/stat-list.ts'
+import { StateBus } from '../../../src/game/engine/state-bus.ts'
+import {
+  MissileEngine,
+  calculateGlacialSpikeDamage,
+  calculateGlacialSpikeFreezeLength,
+  calculateColdMasteryPierce,
+} from '../../../src/game/engine/missile-engine.ts'
+import {
+  computeEffectiveResistance,
+  executeSUnitDmg,
+  type CombatUnitContext,
+} from '../../../src/game/engine/combat-pipeline.ts'
+import { COLLIDE_WALL } from '../../../src/game/d2map.ts'
+
+function createMockCombatUnit(
+  id: string,
+  options?: {
+    hp?: number
+    coldResist?: number
+    cannotBeFrozen?: boolean
+    coldMasterySlvl?: number
+    allSkills?: number
+  },
+): CombatUnitContext {
+  const statList = new UnitStatList()
+  const hp = options?.hp ?? 500
+  statList.setBaseStat('hp', hp * 256)
+  statList.setBaseStat('maxhp', hp * 256)
+  statList.setBaseStat('hitpoints', hp * 256)
+
+  if (options?.coldResist !== undefined) {
+    statList.setBaseStat('coldresist', options.coldResist)
+  }
+
+  if (options?.cannotBeFrozen) {
+    statList.setBaseStat('cannot_be_frozen', 1)
+  }
+
+  if (options?.coldMasterySlvl !== undefined && options.coldMasterySlvl > 0) {
+    const pierce = calculateColdMasteryPierce(options.coldMasterySlvl)
+    statList.setBaseStat('passive_cold_pierce', pierce)
+  }
+
+  if (options?.allSkills) {
+    statList.setAllSkillsBonus(options.allSkills)
+  }
+
+  const stateBus = new StateBus(statList)
+
+  return {
+    id,
+    name: id,
+    statList,
+    stateBus,
+  }
+}
+
+describe('Adversarial Stress Suite — Glacial Spike AoE & Cold Mastery (Commit 375f329)', () => {
+  // =========================================================================
+  // Requirement 1: Glacial Spike 64px Radial Burst Verification
+  // =========================================================================
+  describe('Requirement 1: Glacial Spike 64px Radial Burst Boundary Verification', () => {
+    it('verifies exact distance boundaries: 0px, 30px, 63px, 64px receive hit/freeze; 64.1px, 65px, 80px, 128px receive 0 hit/freeze', async () => {
+      const registry = await getSharedDataRegistry()
+      const engine = new MissileEngine(registry)
+      const attacker = createMockCombatUnit('sorceress')
+
+      // Direct target at (0, 0)
+      const directTarget = createMockCombatUnit('target_0px')
+
+      // Distances to test
+      const testDistances = [
+        { label: 'target_30px', dist: 30, shouldHit: true },
+        { label: 'target_63px', dist: 63, shouldHit: true },
+        { label: 'target_64px', dist: 64, shouldHit: true },
+        { label: 'target_64_1px', dist: 64.1, shouldHit: false },
+        { label: 'target_65px', dist: 65, shouldHit: false },
+        { label: 'target_80px', dist: 80, shouldHit: false },
+        { label: 'target_128px', dist: 128, shouldHit: false },
+      ]
+
+      const splashTargets = testDistances.map(td => ({
+        ...td,
+        unit: createMockCombatUnit(td.label),
+      }))
+
+      const allTargets = [directTarget, ...splashTargets.map(st => st.unit)]
+
+      // Target positions relative to impact point (0, 0)
+      const targetPositions = new Map<string, { x: number; y: number }>()
+      targetPositions.set('target_0px', { x: 0, y: 0 })
+      for (const st of splashTargets) {
+        targetPositions.set(st.label, { x: st.dist, y: 0 })
+      }
+
+      // Spawn missile flying from (-24, 0) straight towards (0, 0)
+      engine.spawnMissile({
+        missileNameOrId: 'glacialspike',
+        sourceSkillId: 55,
+        slvl: 10,
+        owner: attacker,
+        startX: -24,
+        startY: 0,
+        targetX: 0,
+        targetY: 0,
+        dmgPacket: {
+          skillId: 55,
+          elemType: 'cold',
+          elemMin256: 100 * 256,
+          elemMax256: 100 * 256,
+          elemDurationFrames: 77,
+          autoHit: true,
+        },
+        vx: 24,
+        vy: 0,
+        maxRangeTicks: 40,
+      })
+
+      // Tick engine to resolve collision with direct target at (0, 0)
+      const outcome = engine.tick(1, allTargets, targetPositions)
+
+      // Direct hit on target_0px
+      const directHit = outcome.hits.find(h => h.targetId === 'target_0px')
+      expect(directHit).toBeDefined()
+      expect(directHit!.damage).toBeGreaterThan(0)
+      expect(directTarget.stateBus.hasState('freeze')).toBe(true)
+
+      // Verify each splash target
+      for (const st of splashTargets) {
+        const hit = outcome.hits.find(h => h.targetId === st.label)
+        if (st.shouldHit) {
+          expect(hit, `Target at ${st.dist}px should receive splash hit`).toBeDefined()
+          expect(hit!.missileName).toContain('splash')
+          expect(hit!.damage, `Target at ${st.dist}px should receive cold damage`).toBeGreaterThan(0)
+          expect(
+            st.unit.stateBus.hasState('freeze'),
+            `Target at ${st.dist}px should have solid freeze state`,
+          ).toBe(true)
+        } else {
+          expect(hit, `Target at ${st.dist}px should NOT receive splash hit`).toBeUndefined()
+          expect(
+            st.unit.stateBus.hasState('freeze'),
+            `Target at ${st.dist}px should NOT have solid freeze state`,
+          ).toBe(false)
+        }
+      }
+    })
+
+    it('verifies 360-degree radial symmetry across 8 directional axes at r=63.9px (hit) vs r=64.1px (miss)', async () => {
+      const registry = await getSharedDataRegistry()
+      const engine = new MissileEngine(registry)
+      const attacker = createMockCombatUnit('sorceress')
+
+      // Direct target at (100, 100)
+      const center = { x: 100, y: 100 }
+      const directTarget = createMockCombatUnit('center_target')
+
+      const angles = [
+        { name: 'E', rad: 0 },
+        { name: 'NE', rad: Math.PI / 4 },
+        { name: 'N', rad: Math.PI / 2 },
+        { name: 'NW', rad: (3 * Math.PI) / 4 },
+        { name: 'W', rad: Math.PI },
+        { name: 'SW', rad: (5 * Math.PI) / 4 },
+        { name: 'S', rad: (3 * Math.PI) / 2 },
+        { name: 'SE', rad: (7 * Math.PI) / 4 },
+      ]
+
+      const insideUnits: CombatUnitContext[] = []
+      const outsideUnits: CombatUnitContext[] = []
+      const targetPositions = new Map<string, { x: number; y: number }>()
+      targetPositions.set('center_target', center)
+
+      for (const dir of angles) {
+        // Inside boundary: r = 63.9 px
+        const inId = `inside_${dir.name}`
+        const inUnit = createMockCombatUnit(inId)
+        insideUnits.push(inUnit)
+        targetPositions.set(inId, {
+          x: center.x + 63.9 * Math.cos(dir.rad),
+          y: center.y + 63.9 * Math.sin(dir.rad),
+        })
+
+        // Outside boundary: r = 64.1 px
+        const outId = `outside_${dir.name}`
+        const outUnit = createMockCombatUnit(outId)
+        outsideUnits.push(outUnit)
+        targetPositions.set(outId, {
+          x: center.x + 64.1 * Math.cos(dir.rad),
+          y: center.y + 64.1 * Math.sin(dir.rad),
+        })
+      }
+
+      const allTargets = [directTarget, ...insideUnits, ...outsideUnits]
+
+      engine.spawnMissile({
+        missileNameOrId: 'glacialspike',
+        sourceSkillId: 55,
+        slvl: 10,
+        owner: attacker,
+        startX: center.x - 24,
+        startY: center.y,
+        targetX: center.x,
+        targetY: center.y,
+        dmgPacket: {
+          skillId: 55,
+          elemType: 'cold',
+          elemMin256: 100 * 256,
+          elemMax256: 100 * 256,
+          elemDurationFrames: 77,
+          autoHit: true,
+        },
+        vx: 24,
+        vy: 0,
+        maxRangeTicks: 40,
+      })
+
+      const outcome = engine.tick(1, allTargets, targetPositions)
+
+      // Direct hit passes
+      expect(outcome.hits.find(h => h.targetId === 'center_target')).toBeDefined()
+
+      // All 8 inside units receive splash hit and freeze
+      for (const inUnit of insideUnits) {
+        const hit = outcome.hits.find(h => h.targetId === inUnit.id)
+        expect(hit, `${inUnit.id} (r=63.9px) must be hit`).toBeDefined()
+        expect(hit!.damage).toBeGreaterThan(0)
+        expect(inUnit.stateBus.hasState('freeze'), `${inUnit.id} must be frozen`).toBe(true)
+      }
+
+      // All 8 outside units receive 0 hit and no freeze
+      for (const outUnit of outsideUnits) {
+        const hit = outcome.hits.find(h => h.targetId === outUnit.id)
+        expect(hit, `${outUnit.id} (r=64.1px) must NOT be hit`).toBeUndefined()
+        expect(outUnit.stateBus.hasState('freeze'), `${outUnit.id} must NOT be frozen`).toBe(false)
+      }
+    })
+
+    it('handles high-density multi-target clustering inside and outside 64px radius', async () => {
+      const registry = await getSharedDataRegistry()
+      const engine = new MissileEngine(registry)
+      const attacker = createMockCombatUnit('sorceress')
+
+      const center = { x: 50, y: 50 }
+      const directTarget = createMockCombatUnit('cluster_direct')
+      const targetPositions = new Map<string, { x: number; y: number }>()
+      targetPositions.set('cluster_direct', center)
+
+      // Generate 20 units inside (radius 10..60px) and 20 units outside (radius 70..150px)
+      const units: CombatUnitContext[] = [directTarget]
+      const insideIds = new Set<string>()
+      const outsideIds = new Set<string>()
+
+      for (let i = 0; i < 20; i++) {
+        const id = `dense_in_${i}`
+        const radius = 10 + (i / 19) * 53 // 10 to 63 px (strictly inside 64px boundary)
+        const theta = (i * 2.4)
+        targetPositions.set(id, {
+          x: center.x + radius * Math.cos(theta),
+          y: center.y + radius * Math.sin(theta),
+        })
+        units.push(createMockCombatUnit(id))
+        insideIds.add(id)
+      }
+
+      for (let i = 0; i < 20; i++) {
+        const id = `dense_out_${i}`
+        const radius = 64.5 + i * 4 // 64.5 to 140.5 px
+        const theta = (i * 1.7)
+        targetPositions.set(id, {
+          x: center.x + radius * Math.cos(theta),
+          y: center.y + radius * Math.sin(theta),
+        })
+        units.push(createMockCombatUnit(id))
+        outsideIds.add(id)
+      }
+
+      engine.spawnMissile({
+        missileNameOrId: 'glacialspike',
+        sourceSkillId: 55,
+        slvl: 20,
+        owner: attacker,
+        startX: center.x - 20,
+        startY: center.y,
+        targetX: center.x,
+        targetY: center.y,
+        dmgPacket: {
+          skillId: 55,
+          elemType: 'cold',
+          elemMin256: 200 * 256,
+          elemMax256: 200 * 256,
+          elemDurationFrames: 107,
+          autoHit: true,
+        },
+        vx: 20,
+        vy: 0,
+        maxRangeTicks: 40,
+      })
+
+      const outcome = engine.tick(1, units, targetPositions)
+
+      // Direct target hit
+      expect(outcome.hits.find(h => h.targetId === 'cluster_direct')).toBeDefined()
+
+      // Exactly all 20 inside units hit
+      for (const id of insideIds) {
+        const hit = outcome.hits.find(h => h.targetId === id)
+        expect(hit, `Inside cluster unit ${id} should be hit`).toBeDefined()
+        const unit = units.find(u => u.id === id)!
+        expect(unit.stateBus.hasState('freeze')).toBe(true)
+      }
+
+      // Exactly all 20 outside units NOT hit
+      for (const id of outsideIds) {
+        const hit = outcome.hits.find(h => h.targetId === id)
+        expect(hit, `Outside cluster unit ${id} should NOT be hit`).toBeUndefined()
+        const unit = units.find(u => u.id === id)!
+        expect(unit.stateBus.hasState('freeze')).toBe(false)
+      }
+    })
+  })
+
+  // =========================================================================
+  // Requirement 2: Obstacle & Wall Collision Detonation
+  // =========================================================================
+  describe('Requirement 2: Obstacle & Wall Collision Detonation', () => {
+    it('detonates immediately upon hitting a COLLIDE_WALL tile, spawning submissiles and bursting 64px', async () => {
+      const registry = await getSharedDataRegistry()
+      const engine = new MissileEngine(registry)
+      const attacker = createMockCombatUnit('sorceress')
+
+      // Wall at x >= 50
+      // Collision map using overlap returning COLLIDE_WALL (0x0001)
+      const wallTerrain = {
+        overlap: (x: number, _y: number) => (x >= 50 ? COLLIDE_WALL : 0),
+      }
+
+      // Adjacent monster placed along the wall at (50, 35):
+      // - Far enough from flight path y=0 that it avoids direct missile body collision (dist > hitRadius 28px)
+      // - Distance from wall impact point (50, 0) is 35px <= 64px (hit by splash explosion)
+      const nearMonster = createMockCombatUnit('near_wall_monster')
+
+      // Distant monster at (50, 100): distance from wall impact point (50, 0) is 100px > 64px
+      const farMonster = createMockCombatUnit('far_wall_monster')
+
+      const targets = [nearMonster, farMonster]
+      const targetPositions = new Map<string, { x: number; y: number }>([
+        ['near_wall_monster', { x: 50, y: 35 }],
+        ['far_wall_monster', { x: 50, y: 100 }],
+      ])
+
+      // Spawn projectile starting at (0, 0) moving with vx = 24 towards wall
+      engine.spawnMissile({
+        missileNameOrId: 'glacialspike',
+        sourceSkillId: 55,
+        slvl: 10,
+        owner: attacker,
+        startX: 0,
+        startY: 0,
+        targetX: 100,
+        targetY: 0,
+        dmgPacket: {
+          skillId: 55,
+          elemType: 'cold',
+          elemMin256: 91 * 256,
+          elemMax256: 103 * 256,
+          elemDurationFrames: 77,
+          autoHit: true,
+        },
+        vx: 24,
+        vy: 0,
+        maxRangeTicks: 40,
+      })
+
+      // Tick 1: moves from 0 to 24 (not blocked)
+      const tick1 = engine.tick(1, targets, targetPositions, wallTerrain)
+      expect(tick1.hits.length).toBe(0)
+      expect(tick1.subMissilesSpawned.length).toBe(0)
+
+      // Tick 2: moves from 24 to 48 (not blocked)
+      const tick2 = engine.tick(1, targets, targetPositions, wallTerrain)
+      expect(tick2.hits.length).toBe(0)
+      expect(tick2.subMissilesSpawned.length).toBe(0)
+
+      // Tick 3: moves from 48 to 72. Crosses wall at x=50.
+      // Continuous collision stepping stops at wall impact point (50, 0)!
+      const tick3 = engine.tick(1, targets, targetPositions, wallTerrain)
+
+      // 1. Immediate AoE burst hit on nearMonster
+      expect(tick3.hits.length).toBe(1)
+      expect(tick3.hits[0]!.targetId).toBe('near_wall_monster')
+      expect(tick3.hits[0]!.missileName).toContain('splash')
+      expect(tick3.hits[0]!.damage).toBeGreaterThan(0)
+      expect(nearMonster.stateBus.hasState('freeze')).toBe(true)
+
+      // Far monster unaffected
+      expect(farMonster.stateBus.hasState('freeze')).toBe(false)
+
+      // 2. Submissile ejection: 'glacialspikeejecta' and explosion missile
+      expect(tick3.subMissilesSpawned).toContain('glacialspikeejecta')
+      expect(tick3.subMissilesSpawned).toContain('freezeexplode')
+
+      // 3. Projectile expires upon impact
+      const activeSpikes = engine.getActiveMissiles().filter(m => m.name === 'glacialspike')
+      expect(activeSpikes.length).toBe(0)
+    })
+
+    it('verifies continuous stepping prevents tunneling through thin (<24px) walls and detonates correctly', async () => {
+      const registry = await getSharedDataRegistry()
+      const engine = new MissileEngine(registry)
+      const attacker = createMockCombatUnit('sorceress')
+
+      // Thin wall only 8px wide between x=32 and x=40
+      const thinWallTerrain = {
+        overlap: (x: number, _y: number) => (x >= 32 && x <= 40 ? COLLIDE_WALL : 0),
+      }
+
+      // Unit stationed right next to the thin wall at (35, 15)
+      const adjacentUnit = createMockCombatUnit('thin_wall_unit')
+      const targetPositions = new Map<string, { x: number; y: number }>([
+        ['thin_wall_unit', { x: 35, y: 15 }],
+      ])
+
+      // Projectile moves 24px per tick, starting at x=20.
+      // Next step would land at x=44 (beyond the thin wall), but stepping catches x=32!
+      engine.spawnMissile({
+        missileNameOrId: 'glacialspike',
+        sourceSkillId: 55,
+        slvl: 10,
+        owner: attacker,
+        startX: 20,
+        startY: 0,
+        targetX: 100,
+        targetY: 0,
+        dmgPacket: {
+          skillId: 55,
+          elemType: 'cold',
+          elemMin256: 100 * 256,
+          elemMax256: 100 * 256,
+          elemDurationFrames: 77,
+          autoHit: true,
+        },
+        vx: 24,
+        vy: 0,
+        maxRangeTicks: 40,
+      })
+
+      const outcome = engine.tick(1, [adjacentUnit], targetPositions, thinWallTerrain)
+
+      expect(outcome.hits.length).toBe(1)
+      expect(outcome.hits[0]!.targetId).toBe('thin_wall_unit')
+      expect(adjacentUnit.stateBus.hasState('freeze')).toBe(true)
+      expect(outcome.subMissilesSpawned).toContain('glacialspikeejecta')
+    })
+  })
+
+  // =========================================================================
+  // Requirement 3: Freeze Application & Immunity
+  // =========================================================================
+  describe('Requirement 3: Freeze Application & Immunity Verification', () => {
+    it('damages targets with cannot_be_frozen but strictly skips solid freeze state on direct and splash hits', async () => {
+      const registry = await getSharedDataRegistry()
+      const engine = new MissileEngine(registry)
+      const attacker = createMockCombatUnit('sorceress')
+
+      // Direct target with cannot_be_frozen = 1
+      const cbfDirect = createMockCombatUnit('cbf_direct', { cannotBeFrozen: true })
+
+      // Splash target with cannot_be_frozen = 1
+      const cbfSplash = createMockCombatUnit('cbf_splash', { cannotBeFrozen: true })
+
+      // Normal splash target
+      const normalSplash = createMockCombatUnit('normal_splash', { cannotBeFrozen: false })
+
+      const targets = [cbfDirect, cbfSplash, normalSplash]
+      const targetPositions = new Map<string, { x: number; y: number }>([
+        ['cbf_direct', { x: 0, y: 0 }],
+        ['cbf_splash', { x: 25, y: 0 }],
+        ['normal_splash', { x: 0, y: 25 }],
+      ])
+
+      engine.spawnMissile({
+        missileNameOrId: 'glacialspike',
+        sourceSkillId: 55,
+        slvl: 20,
+        owner: attacker,
+        startX: -20,
+        startY: 0,
+        targetX: 0,
+        targetY: 0,
+        dmgPacket: {
+          skillId: 55,
+          elemType: 'cold',
+          elemMin256: 225 * 256,
+          elemMax256: 242 * 256,
+          elemDurationFrames: 107,
+          autoHit: true,
+        },
+        vx: 20,
+        vy: 0,
+        maxRangeTicks: 40,
+      })
+
+      const outcome = engine.tick(1, targets, targetPositions)
+
+      // Direct target receives damage, but NO freeze state
+      const directHit = outcome.hits.find(h => h.targetId === 'cbf_direct')
+      expect(directHit).toBeDefined()
+      expect(directHit!.damage).toBeGreaterThan(0)
+      expect(cbfDirect.stateBus.hasState('freeze')).toBe(false)
+
+      // Splash target with CBF receives splash damage, but NO freeze state
+      const splashHit = outcome.hits.find(h => h.targetId === 'cbf_splash')
+      expect(splashHit).toBeDefined()
+      expect(splashHit!.damage).toBeGreaterThan(0)
+      expect(cbfSplash.stateBus.hasState('freeze')).toBe(false)
+
+      // Normal splash target receives splash damage AND solid freeze state
+      const normalHit = outcome.hits.find(h => h.targetId === 'normal_splash')
+      expect(normalHit).toBeDefined()
+      expect(normalHit!.damage).toBeGreaterThan(0)
+      expect(normalSplash.stateBus.hasState('freeze')).toBe(true)
+    })
+
+    it('verifies cold immune target (res >= 100%) receives 0 damage, immune flag true, and NO freeze state', async () => {
+      const registry = await getSharedDataRegistry()
+      const engine = new MissileEngine(registry)
+      const attacker = createMockCombatUnit('sorceress')
+
+      // Direct target with 120% cold resistance (cold immune)
+      const immuneDirect = createMockCombatUnit('immune_direct', { coldResist: 120 })
+
+      // Splash target with 150% cold resistance (cold immune)
+      const immuneSplash = createMockCombatUnit('immune_splash', { coldResist: 150 })
+
+      // Splash target with 0% cold resistance (normal)
+      const normalSplash = createMockCombatUnit('normal_splash', { coldResist: 0 })
+
+      const targets = [immuneDirect, immuneSplash, normalSplash]
+      const targetPositions = new Map<string, { x: number; y: number }>([
+        ['immune_direct', { x: 0, y: 0 }],
+        ['immune_splash', { x: 20, y: 0 }],
+        ['normal_splash', { x: 0, y: 20 }],
+      ])
+
+      engine.spawnMissile({
+        missileNameOrId: 'glacialspike',
+        sourceSkillId: 55,
+        slvl: 20,
+        owner: attacker,
+        startX: -20,
+        startY: 0,
+        targetX: 0,
+        targetY: 0,
+        dmgPacket: {
+          skillId: 55,
+          elemType: 'cold',
+          elemMin256: 225 * 256,
+          elemMax256: 242 * 256,
+          elemDurationFrames: 107,
+          autoHit: true,
+        },
+        vx: 20,
+        vy: 0,
+        maxRangeTicks: 40,
+      })
+
+      const outcome = engine.tick(1, targets, targetPositions)
+
+      // Direct immune target
+      const directHit = outcome.hits.find(h => h.targetId === 'immune_direct')
+      expect(directHit).toBeDefined()
+      expect(directHit!.immune).toBe(true)
+      expect(directHit!.damage).toBe(0)
+      expect(immuneDirect.stateBus.hasState('freeze')).toBe(false)
+
+      // Splash immune target
+      const splashHit = outcome.hits.find(h => h.targetId === 'immune_splash')
+      expect(splashHit).toBeDefined()
+      expect(splashHit!.immune).toBe(true)
+      expect(splashHit!.damage).toBe(0)
+      expect(immuneSplash.stateBus.hasState('freeze')).toBe(false)
+
+      // Normal splash target receives full damage and solid freeze
+      const normalHit = outcome.hits.find(h => h.targetId === 'normal_splash')
+      expect(normalHit).toBeDefined()
+      expect(normalHit!.immune).toBe(false)
+      expect(normalHit!.damage).toBeGreaterThan(0)
+      expect(normalSplash.stateBus.hasState('freeze')).toBe(true)
+    })
+  })
+
+  // =========================================================================
+  // Requirement 4: Cold Mastery Resistance Sweeps (-100% to +200% vs slvl 1..50)
+  // =========================================================================
+  describe('Requirement 4: Cold Mastery Resistance Sweeps & Combat Calculations', () => {
+    it('verifies Cold Mastery linear formula across slvl 1 to 50: pierce = 20 + (slvl - 1) * 5', () => {
+      for (let slvl = 1; slvl <= 50; slvl++) {
+        const expected = 20 + (slvl - 1) * 5
+        expect(calculateColdMasteryPierce(slvl)).toBe(expected)
+      }
+      expect(calculateColdMasteryPierce(0)).toBe(0)
+      expect(calculateColdMasteryPierce(-1)).toBe(0)
+    })
+
+    it('adversarial sweep: verifies natural cold immune (res >= 100%) is NEVER pierced or reduced by Cold Mastery alone', () => {
+      // Test cold resistance from 100% to 200% across slvl 1 to 50
+      const testLevels = [1, 5, 10, 15, 20, 25, 30, 40, 50]
+      for (let baseRes = 100; baseRes <= 200; baseRes += 5) {
+        for (const slvl of testLevels) {
+          const pierce = calculateColdMasteryPierce(slvl)
+          const result = computeEffectiveResistance({
+            baseRes,
+            passiveEnemyPierce: pierce,
+          })
+
+          // Invariant: Cold Mastery alone cannot break immunity
+          expect(result.isImmune, `baseRes ${baseRes}% with slvl ${slvl} CM must remain immune`).toBe(true)
+          expect(result.effectiveRes, `baseRes ${baseRes}% with slvl ${slvl} CM must have effectiveRes 100`).toBe(100)
+          expect(result.convictionAndLRApplied).toBe(0)
+        }
+      }
+    })
+
+    it('adversarial sweep: verifies strict -100% effective resistance floor clamp for all non-immune resistances', () => {
+      // Sweep base resistance from -100% to 99% against slvl 1 to 50
+      const testLevels = [1, 5, 10, 15, 20, 25, 30, 40, 50]
+      for (let baseRes = -100; baseRes < 100; baseRes += 10) {
+        for (const slvl of testLevels) {
+          const pierce = calculateColdMasteryPierce(slvl)
+          const result = computeEffectiveResistance({
+            baseRes,
+            passiveEnemyPierce: pierce,
+          })
+
+          expect(result.isImmune).toBe(false)
+          const expected = Math.max(-100, Math.min(99, baseRes - pierce))
+          expect(result.effectiveRes, `baseRes ${baseRes} with pierce ${pierce}`).toBe(expected)
+          expect(result.effectiveRes, 'Effective resistance must never drop below -100%').toBeGreaterThanOrEqual(-100)
+        }
+      }
+    })
+
+    it('adversarial sweep: verifies broken immunity allows Cold Mastery to apply at full 100% effect without 1/5 penalty', () => {
+      // Test cases where Conviction breaks immunity (baseRes in 100..116, Conviction 85 -> 85/5 = 17 -> res becomes 83..99)
+      const convictionPierce = 85 // standard slvl 12 Conviction
+      const testLevels = [1, 5, 10, 20, 30, 50]
+
+      for (let baseRes = 100; baseRes <= 116; baseRes++) {
+        for (const slvl of testLevels) {
+          const cmPierce = calculateColdMasteryPierce(slvl)
+          const result = computeEffectiveResistance({
+            baseRes,
+            convictionPierce,
+            passiveEnemyPierce: cmPierce,
+          })
+
+          // 1. Conviction applied at 1/5th to immune: 85 / 5 = 17
+          expect(result.convictionAndLRApplied).toBe(17)
+          const resAfterConv = baseRes - 17
+          expect(result.resAfterConvictionLR).toBe(resAfterConv)
+
+          // 2. Since resAfterConv < 100, target is NO LONGER immune
+          expect(result.isImmune).toBe(false)
+
+          // 3. Cold Mastery applies at full effect without 1/5 penalty, clamped to -100%
+          const expectedEffective = Math.max(-100, Math.min(99, resAfterConv - cmPierce))
+          expect(result.effectiveRes).toBe(expectedEffective)
+        }
+      }
+
+      // Test case where Conviction is NOT enough to break immunity (e.g. baseRes = 120, 120 - 17 = 103 >= 100)
+      for (const slvl of testLevels) {
+        const cmPierce = calculateColdMasteryPierce(slvl)
+        const result = computeEffectiveResistance({
+          baseRes: 120,
+          convictionPierce: 85,
+          passiveEnemyPierce: cmPierce,
+        })
+
+        // Unbroken immunity: target stays immune, effectiveRes stays 100, CM pierce is 0
+        expect(result.isImmune).toBe(true)
+        expect(result.effectiveRes).toBe(100)
+      }
+    })
+
+    it('differential fuzzing: 1000 randomized iterations comparing engine against mathematical oracle', () => {
+      // Independent Mathematical Oracle
+      function oracleEffectiveResistance(
+        baseRes: number,
+        conviction: number,
+        lowerResist: number,
+        passivePierce: number,
+      ): { isImmune: boolean; effectiveRes: number } {
+        const rawConvLR = Math.max(0, Math.trunc(conviction + lowerResist))
+        let convLRApplied = 0
+        if (baseRes >= 100) {
+          convLRApplied = Math.trunc(rawConvLR / 5)
+        } else {
+          convLRApplied = rawConvLR
+        }
+
+        const resAfter = baseRes - convLRApplied
+        if (resAfter >= 100) {
+          return { isImmune: true, effectiveRes: 100 }
+        }
+
+        const eff = Math.max(-100, Math.min(99, resAfter - Math.max(0, Math.trunc(passivePierce))))
+        return { isImmune: false, effectiveRes: eff }
+      }
+
+      // Seeded deterministic pseudo-random number generator for differential fuzzing
+      let seed = 0x1337c0de
+      function nextRand(): number {
+        seed = (seed * 1664525 + 1013904223) >>> 0
+        return seed / 4294967296
+      }
+
+      for (let iter = 1; iter <= 1000; iter++) {
+        // Random base resistance in [-100, 200]
+        const baseRes = Math.floor(nextRand() * 301) - 100
+        // Random Cold Mastery slvl in [0, 50]
+        const slvl = Math.floor(nextRand() * 51)
+        const cmPierce = calculateColdMasteryPierce(slvl)
+        // Random Conviction in [0, 150]
+        const conviction = Math.floor(nextRand() * 151)
+        // Random Lower Resist in [0, 75]
+        const lowerResist = Math.floor(nextRand() * 76)
+
+        const actual = computeEffectiveResistance({
+          baseRes,
+          convictionPierce: conviction,
+          lowerResistPierce: lowerResist,
+          passiveEnemyPierce: cmPierce,
+        })
+
+        const expected = oracleEffectiveResistance(baseRes, conviction, lowerResist, cmPierce)
+
+        expect(actual.isImmune, `Iter ${iter}: isImmune mismatch for baseRes=${baseRes}, slvl=${slvl}`).toBe(
+          expected.isImmune,
+        )
+        expect(actual.effectiveRes, `Iter ${iter}: effectiveRes mismatch for baseRes=${baseRes}, slvl=${slvl}`).toBe(
+          expected.effectiveRes,
+        )
+      }
+    })
+
+    it('SUnitDmg pipeline: validates exact damage multiplier clamping at 2.0x (effectiveRes = -100%)', () => {
+      const attacker = createMockCombatUnit('sorceress_cm', { coldMasterySlvl: 20 }) // 115% pierce
+
+      // Target A: 0% cold res -> with 115% pierce -> effectiveRes = -100% (takes 2.0x damage)
+      const targetA = createMockCombatUnit('target_0res', { coldResist: 0 })
+      const outA = executeSUnitDmg(attacker, targetA, {
+        skillId: 55,
+        attackKind: 'spell',
+        elemType: 'cold',
+        elemMin256: 100 * 256,
+        elemMax256: 100 * 256,
+        autoHit: true,
+      })
+      expect(outA.totalDamage).toBe(200) // 100 * (100 - (-100)) / 100 = 200
+
+      // Target B: -50% cold res with slvl 50 CM (265% pierce) -> clamped to -100% -> STILL takes 2.0x damage
+      const superAttacker = createMockCombatUnit('sorceress_super_cm', { coldMasterySlvl: 50 })
+      const targetB = createMockCombatUnit('target_neg_res', { coldResist: -50 })
+      const outB = executeSUnitDmg(superAttacker, targetB, {
+        skillId: 55,
+        attackKind: 'spell',
+        elemType: 'cold',
+        elemMin256: 100 * 256,
+        elemMax256: 100 * 256,
+        autoHit: true,
+      })
+      expect(outB.totalDamage, 'Damage multiplier must strictly clamp at 2.0x (200 damage)').toBe(200)
+
+      // Target C: 50% cold res -> with 115% pierce -> effectiveRes = -65% -> takes 1.65x damage
+      const targetC = createMockCombatUnit('target_50res', { coldResist: 50 })
+      const outC = executeSUnitDmg(attacker, targetC, {
+        skillId: 55,
+        attackKind: 'spell',
+        elemType: 'cold',
+        elemMin256: 100 * 256,
+        elemMax256: 100 * 256,
+        autoHit: true,
+      })
+      expect(outC.totalDamage).toBe(165) // 100 * (100 - (-65)) / 100 = 165
+    })
+  })
+})

tests/skills/sor/adv-cold-m2-projectiles-stress.test.ts

@@ -0,0 +1,646 @@
+/**
+ * Adversarial Stress-Testing & Boundary Verification Suite
+ * Milestone 2: Cold Projectiles & Cold Mastery (Ice Blast #199, Glacial Spike #209, Cold Mastery #219)
+ *
+ * Verification Categories:
+ * 1. Monotonicity & Continuity Sweeps (slvl 1 to 99 across all 5 level progression bands)
+ * 2. Strict Freeze Duration Monotonicity (slvl 1 to 99)
+ * 3. Linear Synergy Stress Testing (0 to 60 synergy points, overrides & object structures)
+ * 4. Extreme Boundaries & Robustness (slvl <= 0, fractional, NaN, negative, huge values > 1000)
+ * 5. Cold Mastery Resistance Pipeline & Floor Clamping (-100% cap, immunity bypass, broken immunities)
+ * 6. Differential Oracle Testing (Naive band summation vs closed-form implementations)
+ * 7. System Integration & Invariant Enforcement (BATCH1_SKILLS length, mana cost curves, 0 cooldown)
+ */
+
+import { describe, expect, it } from 'vitest'
+import {
+  calculateIceBlastDamage,
+  calculateIceBlastFreezeLength,
+  calculateGlacialSpikeDamage,
+  calculateGlacialSpikeFreezeLength,
+  calculateColdMasteryPierce,
+} from '../../../src/game/engine/missile-engine.ts'
+import {
+  calculateSkillDamage,
+  getSkillManaCost,
+  getSkillCooldownTicks,
+  BATCH1_SKILLS,
+} from '../../../src/game/skills.ts'
+import { computeEffectiveResistance } from '../../../src/game/engine/combat-pipeline.ts'
+
+describe('Adversarial Stress Test: Cold Projectiles & Mastery Milestone 2', () => {
+  // =========================================================================
+  // 1. Monotonicity & Continuity Sweeps (slvl 1 to 99 across 5 Progression Bands)
+  // =========================================================================
+  describe('1. Monotonicity & Continuity Sweeps (slvl 1 to 99)', () => {
+    it('Ice Blast: min <= max and strict positive monotonicity across all 99 levels', () => {
+      let prevDamage = calculateIceBlastDamage(1)
+      expect(prevDamage.min).toBe(8)
+      expect(prevDamage.max).toBe(12)
+      expect(prevDamage.min).toBeLessThanOrEqual(prevDamage.max)
+
+      for (let slvl = 2; slvl <= 99; slvl++) {
+        const current = calculateIceBlastDamage(slvl)
+        // 1. Min damage must never exceed max damage
+        expect(current.min).toBeLessThanOrEqual(current.max)
+        // 2. Strict monotonicity: every single level up MUST increase damage
+        expect(current.min).toBeGreaterThan(prevDamage.min)
+        expect(current.max).toBeGreaterThan(prevDamage.max)
+        prevDamage = current
+      }
+    })
+
+    it('Ice Blast: progression band slope verification across all 5 bands', () => {
+      // Band 1: slvl 1-8 -> +7.0 min, +7.5 max per level
+      for (let slvl = 1; slvl <= 7; slvl++) {
+        const dCurrent = calculateIceBlastDamage(slvl)
+        const dNext = calculateIceBlastDamage(slvl + 1)
+        expect(dNext.min - dCurrent.min).toBeCloseTo(7.0, 5)
+        expect(dNext.max - dCurrent.max).toBeCloseTo(7.5, 5)
+      }
+
+      // Band 2: slvl 8-16 -> +14.0 min, +14.5 max per level
+      for (let slvl = 8; slvl <= 15; slvl++) {
+        const dCurrent = calculateIceBlastDamage(slvl)
+        const dNext = calculateIceBlastDamage(slvl + 1)
+        expect(dNext.min - dCurrent.min).toBeCloseTo(14.0, 5)
+        expect(dNext.max - dCurrent.max).toBeCloseTo(14.5, 5)
+      }
+
+      // Band 3: slvl 16-22 -> +21.0 min, +21.5 max per level
+      for (let slvl = 16; slvl <= 21; slvl++) {
+        const dCurrent = calculateIceBlastDamage(slvl)
+        const dNext = calculateIceBlastDamage(slvl + 1)
+        expect(dNext.min - dCurrent.min).toBeCloseTo(21.0, 5)
+        expect(dNext.max - dCurrent.max).toBeCloseTo(21.5, 5)
+      }
+
+      // Band 4: slvl 22-28 -> +28.0 min, +28.5 max per level
+      for (let slvl = 22; slvl <= 27; slvl++) {
+        const dCurrent = calculateIceBlastDamage(slvl)
+        const dNext = calculateIceBlastDamage(slvl + 1)
+        expect(dNext.min - dCurrent.min).toBeCloseTo(28.0, 5)
+        expect(dNext.max - dCurrent.max).toBeCloseTo(28.5, 5)
+      }
+
+      // Band 5: slvl 28-99 -> +35.0 min, +35.5 max per level
+      for (let slvl = 28; slvl <= 98; slvl++) {
+        const dCurrent = calculateIceBlastDamage(slvl)
+        const dNext = calculateIceBlastDamage(slvl + 1)
+        expect(dNext.min - dCurrent.min).toBeCloseTo(35.0, 5)
+        expect(dNext.max - dCurrent.max).toBeCloseTo(35.5, 5)
+      }
+    })
+
+    it('Glacial Spike: min <= max and strict positive monotonicity across all 99 levels', () => {
+      let prevDamage = calculateGlacialSpikeDamage(1)
+      expect(prevDamage.min).toBe(16)
+      expect(prevDamage.max).toBe(24)
+      expect(prevDamage.min).toBeLessThanOrEqual(prevDamage.max)
+
+      for (let slvl = 2; slvl <= 99; slvl++) {
+        const current = calculateGlacialSpikeDamage(slvl)
+        // 1. Min damage must never exceed max damage
+        expect(current.min).toBeLessThanOrEqual(current.max)
+        // 2. Strict monotonicity
+        expect(current.min).toBeGreaterThan(prevDamage.min)
+        expect(current.max).toBeGreaterThan(prevDamage.max)
+        prevDamage = current
+      }
+    })
+
+    it('Glacial Spike: progression band slope verification across all 5 bands', () => {
+      // Band 1: slvl 1-8 -> +7.0 min, +7.5 max per level
+      for (let slvl = 1; slvl <= 7; slvl++) {
+        const dCurrent = calculateGlacialSpikeDamage(slvl)
+        const dNext = calculateGlacialSpikeDamage(slvl + 1)
+        expect(dNext.min - dCurrent.min).toBeCloseTo(7.0, 5)
+        expect(dNext.max - dCurrent.max).toBeCloseTo(7.5, 5)
+      }
+
+      // Band 2: slvl 8-16 -> +13.0 min, +13.5 max per level
+      for (let slvl = 8; slvl <= 15; slvl++) {
+        const dCurrent = calculateGlacialSpikeDamage(slvl)
+        const dNext = calculateGlacialSpikeDamage(slvl + 1)
+        expect(dNext.min - dCurrent.min).toBeCloseTo(13.0, 5)
+        expect(dNext.max - dCurrent.max).toBeCloseTo(13.5, 5)
+      }
+
+      // Band 3: slvl 16-22 -> +14.0 min, +14.5 max per level
+      for (let slvl = 16; slvl <= 21; slvl++) {
+        const dCurrent = calculateGlacialSpikeDamage(slvl)
+        const dNext = calculateGlacialSpikeDamage(slvl + 1)
+        expect(dNext.min - dCurrent.min).toBeCloseTo(14.0, 5)
+        expect(dNext.max - dCurrent.max).toBeCloseTo(14.5, 5)
+      }
+
+      // Band 4: slvl 22-28 -> +15.0 min, +15.5 max per level
+      for (let slvl = 22; slvl <= 27; slvl++) {
+        const dCurrent = calculateGlacialSpikeDamage(slvl)
+        const dNext = calculateGlacialSpikeDamage(slvl + 1)
+        expect(dNext.min - dCurrent.min).toBeCloseTo(15.0, 5)
+        expect(dNext.max - dCurrent.max).toBeCloseTo(15.5, 5)
+      }
+
+      // Band 5: slvl 28-99 -> +16.0 min, +16.5 max per level
+      for (let slvl = 28; slvl <= 98; slvl++) {
+        const dCurrent = calculateGlacialSpikeDamage(slvl)
+        const dNext = calculateGlacialSpikeDamage(slvl + 1)
+        expect(dNext.min - dCurrent.min).toBeCloseTo(16.0, 5)
+        expect(dNext.max - dCurrent.max).toBeCloseTo(16.5, 5)
+      }
+    })
+
+    it('Cold Mastery: strict positive monotonicity across all 99 levels (+5% per level)', () => {
+      let prevPierce = calculateColdMasteryPierce(1)
+      expect(prevPierce).toBe(20)
+
+      for (let slvl = 2; slvl <= 99; slvl++) {
+        const currentPierce = calculateColdMasteryPierce(slvl)
+        expect(currentPierce).toBeGreaterThan(prevPierce)
+        expect(currentPierce - prevPierce).toBe(5)
+        prevPierce = currentPierce
+      }
+
+      expect(calculateColdMasteryPierce(1)).toBe(20)
+      expect(calculateColdMasteryPierce(10)).toBe(65)
+      expect(calculateColdMasteryPierce(20)).toBe(115)
+      expect(calculateColdMasteryPierce(30)).toBe(165)
+      expect(calculateColdMasteryPierce(99)).toBe(510)
+    })
+  })
+
+  // =========================================================================
+  // 2. Strict Freeze Duration Monotonicity (slvl 1 to 99)
+  // =========================================================================
+  describe('2. Strict Freeze Duration Monotonicity', () => {
+    it('Ice Blast: freeze length increases strictly by +5 frames per level across slvl 1 to 99', () => {
+      let prevLen = calculateIceBlastFreezeLength(1)
+      expect(prevLen).toBe(75) // 3.0s
+
+      for (let slvl = 2; slvl <= 99; slvl++) {
+        const currentLen = calculateIceBlastFreezeLength(slvl)
+        expect(currentLen).toBeGreaterThan(prevLen)
+        expect(currentLen - prevLen).toBe(5)
+        prevLen = currentLen
+      }
+
+      expect(calculateIceBlastFreezeLength(1)).toBe(75)
+      expect(calculateIceBlastFreezeLength(10)).toBe(120)
+      expect(calculateIceBlastFreezeLength(20)).toBe(170)
+      expect(calculateIceBlastFreezeLength(99)).toBe(75 + 98 * 5)
+    })
+
+    it('Ice Blast: freeze length strictly monotonic with non-zero synergy across slvl 1 to 99', () => {
+      for (const syn of [1, 10, 20, 60]) {
+        let prevLen = calculateIceBlastFreezeLength(1, syn)
+        for (let slvl = 2; slvl <= 99; slvl++) {
+          const currentLen = calculateIceBlastFreezeLength(slvl, syn)
+          expect(currentLen).toBeGreaterThan(prevLen)
+          prevLen = currentLen
+        }
+      }
+    })
+
+    it('Glacial Spike: freeze length increases strictly by +3 frames per level across slvl 1 to 99', () => {
+      let prevLen = calculateGlacialSpikeFreezeLength(1)
+      expect(prevLen).toBe(50) // 2.0s
+
+      for (let slvl = 2; slvl <= 99; slvl++) {
+        const currentLen = calculateGlacialSpikeFreezeLength(slvl)
+        expect(currentLen).toBeGreaterThan(prevLen)
+        expect(currentLen - prevLen).toBe(3)
+        prevLen = currentLen
+      }
+
+      expect(calculateGlacialSpikeFreezeLength(1)).toBe(50)
+      expect(calculateGlacialSpikeFreezeLength(10)).toBe(77)
+      expect(calculateGlacialSpikeFreezeLength(20)).toBe(107)
+      expect(calculateGlacialSpikeFreezeLength(99)).toBe(50 + 98 * 3)
+    })
+
+    it('Glacial Spike: freeze length strictly monotonic with non-zero synergy across slvl 1 to 99', () => {
+      for (const syn of [1, 10, 20, 60]) {
+        let prevLen = calculateGlacialSpikeFreezeLength(1, syn)
+        for (let slvl = 2; slvl <= 99; slvl++) {
+          const currentLen = calculateGlacialSpikeFreezeLength(slvl, syn)
+          expect(currentLen).toBeGreaterThan(prevLen)
+          prevLen = currentLen
+        }
+      }
+    })
+  })
+
+  // =========================================================================
+  // 3. Synergy Stress Testing (0 to 60 Points, Linearity & Objects)
+  // =========================================================================
+  describe('3. Synergy Stress Testing', () => {
+    it('Ice Blast: 0 to 60 synergy points scaling (+8% per point) is strictly linear and positive', () => {
+      const baseDmg = calculateIceBlastDamage(20, 0)
+      expect(baseDmg).toEqual({ min: 253, max: 266.5 })
+
+      for (let syn = 0; syn <= 60; syn++) {
+        const current = calculateIceBlastDamage(20, syn)
+        const expectedMultiplier = 1.0 + syn * 0.08
+        const expectedMin = Math.floor((253 * expectedMultiplier + 1e-9) * 10) / 10
+        const expectedMax = Math.floor((266.5 * expectedMultiplier + 1e-9) * 10) / 10
+
+        expect(current.min).toBeCloseTo(expectedMin, 1)
+        expect(current.max).toBeCloseTo(expectedMax, 1)
+        expect(current.min).toBeLessThanOrEqual(current.max)
+      }
+
+      // Check key milestones
+      expect(calculateIceBlastDamage(20, 0)).toEqual({ min: 253, max: 266.5 })
+      expect(calculateIceBlastDamage(20, 20)).toEqual({ min: 657.8, max: 692.9 }) // (1 + 1.6 = 2.6x)
+      expect(calculateIceBlastDamage(20, 60)).toEqual({ min: 1467.4, max: 1545.7 }) // (1 + 4.8 = 5.8x)
+    })
+
+    it('Ice Blast: multi-skill synergy object decomposition parity', () => {
+      // 4 synergy skills: Ice Bolt, Blizzard, Frozen Orb, Glacial Spike
+      const combined = calculateIceBlastDamage(20, {
+        iceBolt: 15,
+        blizzard: 15,
+        frozenOrb: 15,
+        glacialSpike: 15,
+      })
+      // 15 * 4 = 60 total points -> exactly identical to passing numeric 60
+      const numeric = calculateIceBlastDamage(20, 60)
+      expect(combined).toEqual(numeric)
+
+      // Verify each individual synergy contributes identically (symmetric +8%)
+      const viaIceBolt = calculateIceBlastDamage(20, { iceBolt: 20 })
+      const viaBlizzard = calculateIceBlastDamage(20, { blizzard: 20 })
+      const viaFrozenOrb = calculateIceBlastDamage(20, { frozenOrb: 20 })
+      const viaGlacialSpike = calculateIceBlastDamage(20, { glacialSpike: 20 })
+
+      expect(viaIceBolt).toEqual(viaBlizzard)
+      expect(viaBlizzard).toEqual(viaFrozenOrb)
+      expect(viaFrozenOrb).toEqual(viaGlacialSpike)
+    })
+
+    it('Ice Blast: synergy override options (synPctPerLvl and synMultiplier)', () => {
+      // Custom % per level override
+      const customPct = calculateIceBlastDamage(20, 10, { synPctPerLvl: 12 })
+      // 10 * 12% = +120% -> 2.2x
+      expect(customPct.min).toBeCloseTo(253 * 2.2, 1)
+      expect(customPct.max).toBeCloseTo(266.5 * 2.2, 1)
+
+      // Direct multiplier override
+      const directMult = calculateIceBlastDamage(20, undefined, { synMultiplier: 3.5 })
+      expect(directMult.min).toBeCloseTo(253 * 3.5, 1)
+      expect(directMult.max).toBeCloseTo(266.5 * 3.5, 1)
+    })
+
+    it('Glacial Spike: 0 to 60 synergy points scaling (+5% per point) is strictly linear and positive', () => {
+      const baseDmg = calculateGlacialSpikeDamage(20, 0)
+      expect(baseDmg).toEqual({ min: 225, max: 242.5 })
+
+      for (let syn = 0; syn <= 60; syn++) {
+        const current = calculateGlacialSpikeDamage(20, syn)
+        const expectedMultiplier = 1.0 + syn * 0.05
+        const expectedMin = Math.floor((225 * expectedMultiplier + 1e-9) * 10) / 10
+        const expectedMax = Math.floor((242.5 * expectedMultiplier + 1e-9) * 10) / 10
+
+        expect(current.min).toBeCloseTo(expectedMin, 1)
+        expect(current.max).toBeCloseTo(expectedMax, 1)
+        expect(current.min).toBeLessThanOrEqual(current.max)
+      }
+
+      // Check key milestones
+      expect(calculateGlacialSpikeDamage(20, 0)).toEqual({ min: 225, max: 242.5 })
+      expect(calculateGlacialSpikeDamage(20, 20)).toEqual({ min: 450, max: 485 }) // (1 + 1.0 = 2.0x)
+      expect(calculateGlacialSpikeDamage(20, 60)).toEqual({ min: 900, max: 970 }) // (1 + 3.0 = 4.0x)
+    })
+
+    it('Glacial Spike: multi-skill synergy object decomposition parity', () => {
+      // 4 synergy skills: Ice Bolt, Ice Blast, Blizzard, Frozen Orb
+      const combined = calculateGlacialSpikeDamage(20, {
+        iceBolt: 15,
+        iceBlast: 15,
+        blizzard: 15,
+        frozenOrb: 15,
+      })
+      // 15 * 4 = 60 total points -> exactly identical to passing numeric 60
+      const numeric = calculateGlacialSpikeDamage(20, 60)
+      expect(combined).toEqual(numeric)
+
+      // Verify each individual synergy contributes identically (symmetric +5%)
+      const viaIceBolt = calculateGlacialSpikeDamage(20, { iceBolt: 20 })
+      const viaIceBlast = calculateGlacialSpikeDamage(20, { iceBlast: 20 })
+      const viaBlizzard = calculateGlacialSpikeDamage(20, { blizzard: 20 })
+      const viaFrozenOrb = calculateGlacialSpikeDamage(20, { frozenOrb: 20 })
+
+      expect(viaIceBolt).toEqual(viaIceBlast)
+      expect(viaIceBlast).toEqual(viaBlizzard)
+      expect(viaBlizzard).toEqual(viaFrozenOrb)
+    })
+
+    it('Glacial Spike: freeze length synergy scaling with Blizzard (+3% per point)', () => {
+      const baseLen = calculateGlacialSpikeFreezeLength(20, 0)
+      expect(baseLen).toBe(107)
+
+      for (let syn = 0; syn <= 60; syn++) {
+        const len = calculateGlacialSpikeFreezeLength(20, syn)
+        const expected = Math.floor((107 * (100 + syn * 3)) / 100)
+        expect(len).toBe(expected)
+      }
+
+      // Object format parity
+      expect(calculateGlacialSpikeFreezeLength(20, { blizzard: 20 })).toBe(
+        calculateGlacialSpikeFreezeLength(20, 20),
+      )
+    })
+  })
+
+  // =========================================================================
+  // 4. Extreme Boundaries & Robustness Testing
+  // =========================================================================
+  describe('4. Extreme Boundaries & Robustness', () => {
+    it('handles slvl <= 0 gracefully without exceptions or negative damage', () => {
+      for (const invalidLvl of [0, -1, -50, -9999]) {
+        const ibDmg = calculateIceBlastDamage(invalidLvl)
+        expect(ibDmg).toEqual({ min: 8, max: 12 }) // Clamps to lvl 1 base
+
+        const ibFreeze = calculateIceBlastFreezeLength(invalidLvl)
+        expect(ibFreeze).toBe(75) // Clamps to lvl 1 base
+
+        const gsDmg = calculateGlacialSpikeDamage(invalidLvl)
+        expect(gsDmg).toEqual({ min: 16, max: 24 }) // Clamps to lvl 1 base
+
+        const gsFreeze = calculateGlacialSpikeFreezeLength(invalidLvl)
+        expect(gsFreeze).toBe(50) // Clamps to lvl 1 base
+
+        const cmPierce = calculateColdMasteryPierce(invalidLvl)
+        expect(cmPierce).toBe(0) // Passive returns 0 when inactive/unlearned
+
+        // Mana costs for invalid levels clamp to level 1
+        expect(getSkillManaCost(45, invalidLvl)).toBe(6.0)
+        expect(getSkillManaCost(55, invalidLvl)).toBe(10.0)
+        expect(getSkillManaCost(65, invalidLvl)).toBe(0)
+      }
+    })
+
+    it('handles NaN, Infinity, -Infinity, null, and undefined safely', () => {
+      for (const nonFinite of [NaN, Infinity, -Infinity, undefined as any, null as any]) {
+        const ibDmg = calculateIceBlastDamage(nonFinite)
+        expect(Number.isFinite(ibDmg.min)).toBe(true)
+        expect(Number.isFinite(ibDmg.max)).toBe(true)
+        expect(ibDmg).toEqual({ min: 8, max: 12 })
+
+        const ibFreeze = calculateIceBlastFreezeLength(nonFinite)
+        expect(Number.isFinite(ibFreeze)).toBe(true)
+        expect(ibFreeze).toBe(75)
+
+        const gsDmg = calculateGlacialSpikeDamage(nonFinite)
+        expect(Number.isFinite(gsDmg.min)).toBe(true)
+        expect(Number.isFinite(gsDmg.max)).toBe(true)
+        expect(gsDmg).toEqual({ min: 16, max: 24 })
+
+        const gsFreeze = calculateGlacialSpikeFreezeLength(nonFinite)
+        expect(Number.isFinite(gsFreeze)).toBe(true)
+        expect(gsFreeze).toBe(50)
+
+        const cmPierce = calculateColdMasteryPierce(nonFinite)
+        expect(cmPierce).toBe(0)
+
+        expect(getSkillManaCost(45, nonFinite)).toBe(6.0)
+        expect(getSkillManaCost(55, nonFinite)).toBe(10.0)
+        expect(getSkillManaCost(65, nonFinite)).toBe(0)
+      }
+    })
+
+    it('handles fractional slvl values by rounding down consistently (Math.floor)', () => {
+      // 5.2 and 5.9 both evaluate to slvl 5
+      expect(calculateIceBlastDamage(5.2)).toEqual(calculateIceBlastDamage(5))
+      expect(calculateIceBlastDamage(5.9)).toEqual(calculateIceBlastDamage(5))
+      expect(calculateIceBlastFreezeLength(5.2)).toBe(calculateIceBlastFreezeLength(5))
+      expect(calculateIceBlastFreezeLength(5.9)).toBe(calculateIceBlastFreezeLength(5))
+
+      expect(calculateGlacialSpikeDamage(5.2)).toEqual(calculateGlacialSpikeDamage(5))
+      expect(calculateGlacialSpikeDamage(5.9)).toEqual(calculateGlacialSpikeDamage(5))
+      expect(calculateGlacialSpikeFreezeLength(5.2)).toBe(calculateGlacialSpikeFreezeLength(5))
+      expect(calculateGlacialSpikeFreezeLength(5.9)).toBe(calculateGlacialSpikeFreezeLength(5))
+
+      expect(calculateColdMasteryPierce(5.2)).toBe(calculateColdMasteryPierce(5))
+      expect(calculateColdMasteryPierce(5.9)).toBe(calculateColdMasteryPierce(5))
+    })
+
+    it('handles very large values (> 1000) stably without overflow or precision collapse', () => {
+      const largeLvl = 1000
+      const ibDmg = calculateIceBlastDamage(largeLvl)
+      expect(Number.isFinite(ibDmg.min)).toBe(true)
+      expect(Number.isFinite(ibDmg.max)).toBe(true)
+      expect(ibDmg.min).toBeLessThanOrEqual(ibDmg.max)
+      expect(ibDmg.min).toBeGreaterThan(10000)
+
+      const gsDmg = calculateGlacialSpikeDamage(largeLvl)
+      expect(Number.isFinite(gsDmg.min)).toBe(true)
+      expect(Number.isFinite(gsDmg.max)).toBe(true)
+      expect(gsDmg.min).toBeLessThanOrEqual(gsDmg.max)
+      expect(gsDmg.min).toBeGreaterThan(10000)
+
+      const cmPierce = calculateColdMasteryPierce(largeLvl)
+      expect(cmPierce).toBe(20 + 999 * 5) // 5015% pierce
+    })
+
+    it('handles adversarial negative synergy values and clamped multiplier overrides', () => {
+      // Negative synergy numbers clamped to 0
+      expect(calculateIceBlastDamage(20, -50)).toEqual(calculateIceBlastDamage(20, 0))
+      expect(calculateGlacialSpikeDamage(20, -50)).toEqual(calculateGlacialSpikeDamage(20, 0))
+      expect(calculateIceBlastFreezeLength(20, -50)).toBe(calculateIceBlastFreezeLength(20, 0))
+      expect(calculateGlacialSpikeFreezeLength(20, -50)).toBe(calculateGlacialSpikeFreezeLength(20, 0))
+
+      // Negative synergy object members clamped to 0
+      expect(
+        calculateIceBlastDamage(20, { iceBolt: -10, blizzard: -20, frozenOrb: -5 } as any),
+      ).toEqual(calculateIceBlastDamage(20, 0))
+      expect(
+        calculateGlacialSpikeDamage(20, { iceBolt: -10, blizzard: -20, frozenOrb: -5 } as any),
+      ).toEqual(calculateGlacialSpikeDamage(20, 0))
+
+      // Multiplier overrides: negative or zero multiplier clamped to >= 0
+      expect(calculateIceBlastDamage(20, undefined, { synMultiplier: -2 })).toEqual({ min: 0, max: 0 })
+      expect(calculateIceBlastDamage(20, undefined, { synMultiplier: 0 })).toEqual({ min: 0, max: 0 })
+      expect(calculateGlacialSpikeDamage(20, undefined, { synMultiplier: -2 })).toEqual({ min: 0, max: 0 })
+      expect(calculateGlacialSpikeDamage(20, undefined, { synMultiplier: 0 })).toEqual({ min: 0, max: 0 })
+    })
+  })
+
+  // =========================================================================
+  // 5. Cold Mastery Combat Pipeline Adversarial Scenarios
+  // =========================================================================
+  describe('5. Cold Mastery Combat Pipeline Adversarial Scenarios', () => {
+    it('authentically clamps effective resistance at -100% floor for vulnerable enemies', () => {
+      // Slvl 20 Cold Mastery: -115% pierce
+      const cm20 = calculateColdMasteryPierce(20)
+      expect(cm20).toBe(115)
+
+      // Case 1: Enemy has 0% Cold Res -> 0 - 115 = -115%, but clamped at -100%
+      const res0 = computeEffectiveResistance({ baseRes: 0, passiveEnemyPierce: cm20 })
+      expect(res0.effectiveRes).toBe(-100)
+      expect(res0.isImmune).toBe(false)
+
+      // Case 2: Enemy has -50% Cold Res -> -50 - 115 = -165%, clamped at -100%
+      const resNeg50 = computeEffectiveResistance({ baseRes: -50, passiveEnemyPierce: cm20 })
+      expect(resNeg50.effectiveRes).toBe(-100)
+
+      // Case 3: Enemy has 50% Cold Res -> 50 - 115 = -65% (within [-100, 99])
+      const res50 = computeEffectiveResistance({ baseRes: 50, passiveEnemyPierce: cm20 })
+      expect(res50.effectiveRes).toBe(-65)
+      expect(res50.isImmune).toBe(false)
+    })
+
+    it('Cold Mastery alone CANNOT pierce Cold Immune monsters (res >= 100%)', () => {
+      const cm20 = calculateColdMasteryPierce(20) // 115% pierce
+      const cm99 = calculateColdMasteryPierce(99) // 510% pierce
+
+      // Target with 100% Cold Res (immune)
+      const res100 = computeEffectiveResistance({ baseRes: 100, passiveEnemyPierce: cm20 })
+      expect(res100.isImmune).toBe(true)
+      expect(res100.effectiveRes).toBe(100)
+
+      // Target with 140% Cold Res (immune) with slvl 99 Cold Mastery
+      const res140 = computeEffectiveResistance({ baseRes: 140, passiveEnemyPierce: cm99 })
+      expect(res140.isImmune).toBe(true)
+      expect(res140.effectiveRes).toBe(100)
+    })
+
+    it('Broken Cold Immunities receive 100% Cold Mastery pierce without 1/5 penalty', () => {
+      // Target with 110% Cold Res
+      // Conviction Level 25: -150% pierce
+      // When baseRes >= 100%, Conviction applies at 1/5th effectiveness -> -30%
+      // New resistance = 110 - 30 = 80% (< 100% -> immunity broken!)
+      // Once broken, Cold Mastery (slvl 20 = -115%) applies at full 100% effectiveness:
+      // Final effective resistance = 80 - 115 = -35%
+      const cm20 = calculateColdMasteryPierce(20)
+      const brokenResult = computeEffectiveResistance({
+        baseRes: 110,
+        convictionPierce: 150,
+        passiveEnemyPierce: cm20,
+      })
+      expect(brokenResult.isImmune).toBe(false)
+      expect(brokenResult.convictionAndLRApplied).toBe(30)
+      expect(brokenResult.resAfterConvictionLR).toBe(80)
+      expect(brokenResult.effectiveRes).toBe(-35)
+    })
+
+    it('Unbreakable Cold Immunities stay immune and bypass Cold Mastery entirely', () => {
+      // Target with 140% Cold Res
+      // Conviction Level 25 (-150% -> 1/5 = -30%)
+      // Res after Conviction = 140 - 30 = 110% (still >= 100% -> immune remains unbroken!)
+      // Cold Mastery must NOT apply!
+      const cm20 = calculateColdMasteryPierce(20)
+      const unbrokenResult = computeEffectiveResistance({
+        baseRes: 140,
+        convictionPierce: 150,
+        passiveEnemyPierce: cm20,
+      })
+      expect(unbrokenResult.isImmune).toBe(true)
+      expect(unbrokenResult.convictionAndLRApplied).toBe(30)
+      expect(unbrokenResult.resAfterConvictionLR).toBe(110)
+      expect(unbrokenResult.effectiveRes).toBe(100)
+    })
+  })
+
+  // =========================================================================
+  // 6. Differential Oracle Testing (Naive Band Summation vs Implementation)
+  // =========================================================================
+  describe('6. Differential Oracle Testing', () => {
+    // Naive brute-force simulator for 1.13c 5-band table evaluation
+    function naiveBandEvaluator(
+      baseMin: number,
+      baseMax: number,
+      minSteps: number[],
+      maxSteps: number[],
+      slvl: number,
+    ): { min: number; max: number } {
+      const lvl = Math.max(1, Math.floor(slvl))
+      let curMin = baseMin
+      let curMax = baseMax
+      for (let l = 2; l <= lvl; l++) {
+        let stepIdx = 0
+        if (l >= 2 && l <= 8) stepIdx = 0
+        else if (l >= 9 && l <= 16) stepIdx = 1
+        else if (l >= 17 && l <= 22) stepIdx = 2
+        else if (l >= 23 && l <= 28) stepIdx = 3
+        else stepIdx = 4
+        curMin += minSteps[stepIdx]
+        curMax += maxSteps[stepIdx]
+      }
+      return { min: curMin / 2, max: curMax / 2 }
+    }
+
+    it('Ice Blast: matches naive brute-force 5-band oracle across all 99 levels', () => {
+      const minSteps = [14, 28, 42, 56, 70]
+      const maxSteps = [15, 29, 43, 57, 71]
+
+      for (let slvl = 1; slvl <= 99; slvl++) {
+        const oracle = naiveBandEvaluator(16, 24, minSteps, maxSteps, slvl)
+        const actual = calculateIceBlastDamage(slvl)
+        expect(actual.min).toBe(oracle.min)
+        expect(actual.max).toBe(oracle.max)
+      }
+    })
+
+    it('Glacial Spike: matches naive brute-force 5-band oracle across all 99 levels', () => {
+      const minSteps = [14, 26, 28, 30, 32]
+      const maxSteps = [15, 27, 29, 31, 33]
+
+      for (let slvl = 1; slvl <= 99; slvl++) {
+        const oracle = naiveBandEvaluator(32, 48, minSteps, maxSteps, slvl)
+        const actual = calculateGlacialSpikeDamage(slvl)
+        expect(actual.min).toBe(oracle.min)
+        expect(actual.max).toBe(oracle.max)
+      }
+    })
+  })
+
+  // =========================================================================
+  // 7. System Integration & Invariant Enforcement
+  // =========================================================================
+  describe('7. System Integration & Invariant Enforcement', () => {
+    it('BATCH1_SKILLS length remains strictly 38', () => {
+      expect(Object.keys(BATCH1_SKILLS).length).toBe(38)
+    })
+
+    it('calculateSkillDamage dispatcher cleanly routes skills 45, 55, and 65', () => {
+      expect(calculateSkillDamage(45, 10, { iceBolt: 5 })).toEqual(
+        calculateIceBlastDamage(10, { iceBolt: 5 }),
+      )
+      expect(calculateSkillDamage('iceblast', 10, 5)).toEqual(
+        calculateIceBlastDamage(10, 5),
+      )
+      expect(calculateSkillDamage(55, 10, { blizzard: 5 })).toEqual(
+        calculateGlacialSpikeDamage(10, { blizzard: 5 }),
+      )
+      expect(calculateSkillDamage('glacialspike', 10, 5)).toEqual(
+        calculateGlacialSpikeDamage(10, 5),
+      )
+      // Cold Mastery is passive, returns { min: 0, max: 0 }
+      expect(calculateSkillDamage(65, 20)).toEqual({ min: 0, max: 0 })
+      expect(calculateSkillDamage('coldmastery', 20)).toEqual({ min: 0, max: 0 })
+    })
+
+    it('mana costs and cooldown ticks adhere strictly to 1.13c specification', () => {
+      // Ice Blast: (12 + slvl - 1) * 0.5
+      expect(getSkillManaCost(45, 1)).toBe(6.0)
+      expect(getSkillManaCost(45, 10)).toBe(10.5)
+      expect(getSkillManaCost(45, 20)).toBe(15.5)
+
+      // Glacial Spike: (20 + slvl - 1) * 0.5
+      expect(getSkillManaCost(55, 1)).toBe(10.0)
+      expect(getSkillManaCost(55, 10)).toBe(14.5)
+      expect(getSkillManaCost(55, 20)).toBe(19.5)
+
+      // Cold Mastery: passive 0 mana
+      expect(getSkillManaCost(65, 1)).toBe(0)
+      expect(getSkillManaCost(65, 20)).toBe(0)
+
+      // 0 cooldown ticks
+      expect(getSkillCooldownTicks(45)).toBe(0)
+      expect(getSkillCooldownTicks(55)).toBe(0)
+      expect(getSkillCooldownTicks(65)).toBe(0)
+    })
+  })
+})

tests/speedbar-authentic-parity.test.ts

@@ -0,0 +1,580 @@
+import { describe, it, expect, beforeEach } from 'vitest'
+import {
+  SkillHotkeysHud,
+  DEFAULT_UNIVERSAL_SKILLS,
+  DEFAULT_SORCERESS_SKILLS,
+  isLeftUsableSkill,
+  isPassiveSkill,
+  isAuraSkill,
+  getSkillListRow,
+  getSkillReqLevel,
+  LEFT_SKILL_BOUNDS,
+  RIGHT_SKILL_BOUNDS,
+} from '../src/ui/hotkeys.ts'
+import type { HotkeySkillEntry } from '../src/ui/hotkeys.ts'
+import { SKILLS_CATALOG, SKILLS_BY_CLASS } from '../src/data/skills-catalog.ts'
+import type { SkillCatalogEntry } from '../src/data/skills-catalog.ts'
+import { CHARACTER_CLASS_CODES } from '../src/game/classes.ts'
+
+describe('Diablo II v1.13c Speedbar Authentic Parity (All 7 Classes)', () => {
+  let hud: SkillHotkeysHud
+
+  beforeEach(() => {
+    hud = new SkillHotkeysHud()
+  })
+
+  // Helper to convert catalog entries into complete HotkeySkillEntry objects
+  function createClassSkillEntries(entries: readonly SkillCatalogEntry[]): HotkeySkillEntry[] {
+    return entries.map(s => ({
+      skillId: s.id,
+      name: s.name,
+      nameZh: s.nameZh,
+      level: 1,
+      manaCost: s.mana,
+      leftUsable: isLeftUsableSkill(s.id),
+      rightUsable: !isPassiveSkill(s.id),
+      isAura: isAuraSkill(s.id),
+      isPassive: isPassiveSkill(s.id),
+      tabIndex: s.tabIndex,
+      reqlevel: s.reqlevel,
+    }))
+  }
+
+  // =========================================================================
+  // 1. Ground Truth Catalog Mapping: ListRow & ReqLevel
+  // =========================================================================
+  describe('1. Ground Truth Catalog Mapping', () => {
+    it('maps all 210 class skills in SKILLS_CATALOG to ListRow = tabIndex + 1 with 100% parity', () => {
+      expect(SKILLS_CATALOG.length).toBe(210)
+      for (const s of SKILLS_CATALOG) {
+        const entry: HotkeySkillEntry = {
+          skillId: s.id,
+          name: s.name,
+          nameZh: s.nameZh,
+          level: 1,
+          manaCost: s.mana,
+          leftUsable: isLeftUsableSkill(s.id),
+          rightUsable: !isPassiveSkill(s.id),
+          tabIndex: s.tabIndex,
+        }
+        const row = getSkillListRow(entry)
+        expect(row).toBe(s.tabIndex + 1)
+        expect(row).toBeGreaterThanOrEqual(1)
+        expect(row).toBeLessThanOrEqual(3)
+      }
+    })
+
+    it('maps universal / basic actions to ListRow = 0', () => {
+      const basicActions = [
+        { skillId: 0, name: 'Attack', leftUsable: true, rightUsable: true },
+        { skillId: 2, name: 'Throw', leftUsable: true, rightUsable: true },
+        { skillId: 3, name: 'Unsummon', leftUsable: false, rightUsable: true },
+        { skillId: 4, name: 'Left Hand Throw', leftUsable: true, rightUsable: true },
+        { skillId: 5, name: 'Left Hand Swing', leftUsable: true, rightUsable: true },
+        { skillId: 350, name: 'Delerium Change', leftUsable: false, rightUsable: true },
+      ]
+      for (const action of basicActions) {
+        const row = getSkillListRow({
+          skillId: action.skillId,
+          name: action.name,
+          nameZh: action.name,
+          level: 1,
+          manaCost: 0,
+          leftUsable: action.leftUsable,
+          rightUsable: action.rightUsable,
+        })
+        expect(row).toBe(0)
+      }
+    })
+
+    it('maps item skills (Town Portal, Identify, Charges) to ListRow = 4', () => {
+      const itemSkills = [
+        { skillId: 217, name: 'Scroll of Identify' },
+        { skillId: 218, name: 'Tome of Identify' },
+        { skillId: 219, name: 'Scroll of Town Portal' },
+        { skillId: 220, name: 'Tome of Town Portal' },
+        { skillId: 999, name: 'Teleport Charge Item', isItemSkill: true },
+      ]
+      for (const item of itemSkills) {
+        const row = getSkillListRow({
+          skillId: item.skillId,
+          name: item.name,
+          nameZh: item.name,
+          level: 1,
+          manaCost: 0,
+          leftUsable: false,
+          rightUsable: true,
+          isItemSkill: (item as any).isItemSkill,
+        })
+        expect(row).toBe(4)
+      }
+    })
+
+    it('maps charged class skills (e.g. Teleport 54, Life Tap 82, Lower Resist 91) to ListRow = 4', () => {
+      const chargedSkills: HotkeySkillEntry[] = [
+        { skillId: 54, name: 'Teleport', nameZh: '传送', level: 1, manaCost: 24, charges: 20, maxCharges: 20, leftUsable: false, rightUsable: true },
+        { skillId: 82, name: 'Life Tap', nameZh: '偷取生命', level: 1, manaCost: 9, charges: 15, maxCharges: 15, leftUsable: false, rightUsable: true },
+        { skillId: 91, name: 'Lower Resist', nameZh: '降低抵抗', level: 1, manaCost: 22, charges: 10, maxCharges: 10, leftUsable: false, rightUsable: true },
+      ]
+      for (const skill of chargedSkills) {
+        expect(getSkillListRow(skill)).toBe(4)
+      }
+    })
+
+    it('retrieves accurate reqlevel from catalog for all skills', () => {
+      for (const s of SKILLS_CATALOG) {
+        const entry: HotkeySkillEntry = {
+          skillId: s.id,
+          name: s.name,
+          nameZh: s.nameZh,
+          level: 1,
+          manaCost: s.mana,
+          leftUsable: true,
+          rightUsable: true,
+        }
+        expect(getSkillReqLevel(entry)).toBe(s.reqlevel)
+      }
+      // Basic actions default to reqlevel 1
+      expect(getSkillReqLevel({ skillId: 0, name: 'Attack', nameZh: '攻击', level: 1, manaCost: 0, leftUsable: true, rightUsable: true })).toBe(1)
+      expect(getSkillReqLevel({ skillId: 2, name: 'Throw', nameZh: '投掷', level: 1, manaCost: 0, leftUsable: true, rightUsable: true })).toBe(1)
+      expect(getSkillReqLevel({ skillId: 3, name: 'Unsummon', nameZh: '取消召唤', level: 1, manaCost: 0, leftUsable: false, rightUsable: true })).toBe(1)
+    })
+  })
+
+  // =========================================================================
+  // 2. Usability Filters (Left vs Right) Across All 7 Classes
+  // =========================================================================
+  describe('2. Usability Filters (Left vs Right) Across All 7 Classes', () => {
+    CHARACTER_CLASS_CODES.forEach(cls => {
+      it(`enforces authentic 1.13c left and right filters for ${cls.toUpperCase()}`, () => {
+        const classSkills = createClassSkillEntries(SKILLS_BY_CLASS[cls])
+        const allSkills: HotkeySkillEntry[] = [...DEFAULT_UNIVERSAL_SKILLS, ...classSkills]
+        hud.setAvailableSkills(allSkills)
+
+        // --- Left Click Speedbar ---
+        const leftCells = hud.getPopupCells('left')
+        for (const cell of leftCells) {
+          const id = cell.skill.skillId
+          // 1. Passive skills strictly filtered out
+          expect(isPassiveSkill(id)).toBe(false)
+          expect(cell.skill.isPassive).toBeFalsy()
+          // 2. Aura skills strictly filtered out
+          expect(isAuraSkill(id)).toBe(false)
+          expect(cell.skill.isAura).toBeFalsy()
+          // 3. Must be an official 1.13c left skill
+          expect(isLeftUsableSkill(id)).toBe(true)
+          // 4. Unsummon (3) is right-only
+          expect(id).not.toBe(3)
+        }
+
+        // --- Right Click Speedbar ---
+        const rightCells = hud.getPopupCells('right')
+        for (const cell of rightCells) {
+          const id = cell.skill.skillId
+          // 1. Passive skills strictly filtered out
+          expect(isPassiveSkill(id)).toBe(false)
+          expect(cell.skill.isPassive).toBeFalsy()
+          // 2. Right click allows both active skills and auras
+          expect(cell.skill.rightUsable !== false).toBe(true)
+        }
+      })
+    })
+
+    it('strictly excludes Meteor (56) and Blizzard (59) from Sorceress left speedbar', () => {
+      hud.setAvailableSkills([...DEFAULT_SORCERESS_SKILLS])
+      const leftCells = hud.getPopupCells('left')
+      const leftIds = leftCells.map(c => c.skill.skillId)
+
+      expect(leftIds).not.toContain(56) // Meteor
+      expect(leftIds).not.toContain(59) // Blizzard
+      expect(leftIds).toContain(47)     // Fire Ball
+      expect(leftIds).toContain(55)     // Glacial Spike
+      expect(leftIds).toContain(38)     // Charged Bolt
+      expect(leftIds).toContain(0)      // Normal Attack
+
+      const rightCells = hud.getPopupCells('right')
+      const rightIds = rightCells.map(c => c.skill.skillId)
+      expect(rightIds).toContain(56)    // Meteor present on right
+      expect(rightIds).toContain(59)    // Blizzard present on right
+    })
+
+    it('strictly includes Maul (233) on Druid left speedbar', () => {
+      const druidSkills = createClassSkillEntries(SKILLS_BY_CLASS.dru)
+      hud.setAvailableSkills([...DEFAULT_UNIVERSAL_SKILLS, ...druidSkills])
+      const leftIds = hud.getPopupCells('left').map(c => c.skill.skillId)
+      expect(leftIds).toContain(233) // Maul
+      expect(leftIds).not.toContain(228) // Cyclone Armor (buff, leftskill=0)
+      expect(leftIds).not.toContain(226) // Oak Sage (summon, leftskill=0)
+    })
+
+    it('strictly excludes all Paladin auras and Holy Shield from left speedbar', () => {
+      const paladinSkills = createClassSkillEntries(SKILLS_BY_CLASS.pal)
+      hud.setAvailableSkills([...DEFAULT_UNIVERSAL_SKILLS, ...paladinSkills])
+      const leftCells = hud.getPopupCells('left')
+      const leftIds = leftCells.map(c => c.skill.skillId)
+
+      // No aura allowed
+      expect(leftIds).not.toContain(98)  // Might
+      expect(leftIds).not.toContain(102) // Holy Fire
+      expect(leftIds).not.toContain(113) // Holy Freeze
+      expect(leftIds).not.toContain(118) // Holy Shock
+      expect(leftIds).not.toContain(122) // Fanaticism
+      expect(leftIds).not.toContain(125) // Salvation
+      expect(leftIds).not.toContain(99)  // Prayer
+      expect(leftIds).not.toContain(109) // Cleansing
+      expect(leftIds).not.toContain(115) // Vigor
+      expect(leftIds).not.toContain(124) // Redemption
+      expect(leftIds).not.toContain(117) // Holy Shield (self-buff, leftskill=0)
+
+      // Combat skills allowed
+      expect(leftIds).toContain(96)  // Sacrifice
+      expect(leftIds).toContain(97)  // Smite
+      expect(leftIds).toContain(101) // Holy Bolt
+      expect(leftIds).toContain(106) // Zeal
+      expect(leftIds).toContain(107) // Charge
+      expect(leftIds).toContain(111) // Vengeance
+      expect(leftIds).toContain(112) // Blessed Hammer
+      expect(leftIds).toContain(116) // Conversion
+      expect(leftIds).toContain(121) // Fist of the Heavens
+
+      // Right speedbar includes auras with yellow border marker
+      const rightCells = hud.getPopupCells('right')
+      const rightAuras = rightCells.filter(c => isAuraSkill(c.skill.skillId))
+      expect(rightAuras.length).toBe(20) // All 20 Paladin auras
+    })
+
+    it('strictly excludes Barbarian combat mastery passives from both speedbars', () => {
+      const barbarianSkills = createClassSkillEntries(SKILLS_BY_CLASS.bar)
+      hud.setAvailableSkills([...DEFAULT_UNIVERSAL_SKILLS, ...barbarianSkills])
+      const leftIds = hud.getPopupCells('left').map(c => c.skill.skillId)
+      const rightIds = hud.getPopupCells('right').map(c => c.skill.skillId)
+
+      const passives = [127, 128, 129, 134, 135, 136, 141, 145, 148, 153]
+      for (const p of passives) {
+        expect(leftIds).not.toContain(p)
+        expect(rightIds).not.toContain(p)
+      }
+    })
+  })
+
+  // =========================================================================
+  // 3. Multi-Row Grouping & Row Compaction
+  // =========================================================================
+  describe('3. Multi-Row Grouping & Row Compaction', () => {
+    it('compacts Barbarian right-click speedbar from [0, 1, 3] into contiguous visualRows [0, 1, 2]', () => {
+      const barbarianSkills = createClassSkillEntries(SKILLS_BY_CLASS.bar)
+      hud.setAvailableSkills([...DEFAULT_UNIVERSAL_SKILLS, ...barbarianSkills])
+      const rightCells = hud.getPopupCells('right')
+
+      // Barbarian has:
+      // ListRow 0: Attack (0), Throw (2), Unsummon (3)
+      // ListRow 1: Combat Skills (10 active)
+      // ListRow 2: Combat Masteries (10 PASSIVES -> 0 active)
+      // ListRow 3: Warcries (10 active)
+      const listRowsPresent = Array.from(new Set(rightCells.map(c => c.listRow))).sort((a, b) => a - b)
+      expect(listRowsPresent).toEqual([0, 1, 3])
+
+      const visualRowsPresent = Array.from(new Set(rightCells.map(c => c.visualRow))).sort((a, b) => a - b)
+      expect(visualRowsPresent).toEqual([0, 1, 2])
+
+      // Verify that every cell in ListRow 3 is compacted into visualRow 2
+      const warcriesCells = rightCells.filter(c => c.listRow === 3)
+      expect(warcriesCells.length).toBe(10)
+      for (const cell of warcriesCells) {
+        expect(cell.visualRow).toBe(2)
+      }
+    })
+
+    it('compacts Paladin left-click speedbar to contiguous visualRows [0, 1]', () => {
+      const paladinSkills = createClassSkillEntries(SKILLS_BY_CLASS.pal)
+      hud.setAvailableSkills([...DEFAULT_UNIVERSAL_SKILLS, ...paladinSkills])
+      const leftCells = hud.getPopupCells('left')
+
+      // ListRow 0 (Universal), ListRow 1 (Combat skills). ListRow 2 and 3 are auras (filtered out).
+      const listRowsPresent = Array.from(new Set(leftCells.map(c => c.listRow))).sort((a, b) => a - b)
+      expect(listRowsPresent).toEqual([0, 1])
+
+      const visualRowsPresent = Array.from(new Set(leftCells.map(c => c.visualRow))).sort((a, b) => a - b)
+      expect(visualRowsPresent).toEqual([0, 1])
+    })
+
+    it('compacts single-tree character without gap rows', () => {
+      // Character that only learned Lightning Spells (Tab 2 => ListRow 2)
+      const lightSpells = createClassSkillEntries(SKILLS_BY_CLASS.sor.filter(s => s.tabIndex === 1 && !isPassiveSkill(s.id)))
+
+      hud.setAvailableSkills([...DEFAULT_UNIVERSAL_SKILLS, ...lightSpells])
+      const rightCells = hud.getPopupCells('right')
+
+      // ListRow 0 (Universal) and ListRow 2 (Lightning)
+      const listRowsPresent = Array.from(new Set(rightCells.map(c => c.listRow))).sort((a, b) => a - b)
+      expect(listRowsPresent).toEqual([0, 2])
+
+      // Compacted to visualRow 0 and 1
+      const visualRowsPresent = Array.from(new Set(rightCells.map(c => c.visualRow))).sort((a, b) => a - b)
+      expect(visualRowsPresent).toEqual([0, 1])
+
+      const lightCells = rightCells.filter(c => c.listRow === 2)
+      for (const cell of lightCells) {
+        expect(cell.visualRow).toBe(1)
+      }
+    })
+
+    it('maintains contiguous visualRow compaction with item skills across all 7 classes', () => {
+      const itemSkills: HotkeySkillEntry[] = [
+        { skillId: 219, name: 'Scroll of Town Portal', nameZh: '城镇传送卷轴', level: 1, manaCost: 0, isItemSkill: true, leftUsable: false, rightUsable: true },
+        { skillId: 217, name: 'Scroll of Identify', nameZh: '辨识卷轴', level: 1, manaCost: 0, isItemSkill: true, leftUsable: false, rightUsable: true },
+      ]
+      for (const cls of CHARACTER_CLASS_CODES) {
+        const classSkills = createClassSkillEntries(SKILLS_BY_CLASS[cls])
+        hud.setAvailableSkills([...DEFAULT_UNIVERSAL_SKILLS, ...classSkills, ...itemSkills])
+        const rightCells = hud.getPopupCells('right')
+        const visualRows = Array.from(new Set(rightCells.map(c => c.visualRow))).sort((a, b) => a - b)
+        for (let i = 0; i < visualRows.length; i++) {
+          expect(visualRows[i]).toBe(i)
+        }
+        const itemCells = rightCells.filter(c => c.listRow === 4)
+        const maxRow = Math.max(...visualRows)
+        for (const cell of itemCells) {
+          expect(cell.visualRow).toBe(maxRow)
+        }
+      }
+    })
+
+    it('correctly places charged skills in ListRow 4 on a non-native class (Barbarian with Teleport charges)', () => {
+      const barbarianSkills = createClassSkillEntries(SKILLS_BY_CLASS.bar)
+      const tpChargedItem: HotkeySkillEntry = {
+        skillId: 54,
+        name: 'Teleport',
+        nameZh: '传送',
+        level: 1,
+        manaCost: 24,
+        charges: 20,
+        maxCharges: 20,
+        leftUsable: false,
+        rightUsable: true,
+      }
+      hud.setAvailableSkills([...DEFAULT_UNIVERSAL_SKILLS, ...barbarianSkills, tpChargedItem])
+      const rightCells = hud.getPopupCells('right')
+      const tpCell = rightCells.find(c => c.skill.skillId === 54)
+      expect(tpCell).toBeDefined()
+      expect(tpCell!.listRow).toBe(4)
+      // Visual rows: 0 (Universal), 1 (Combat skills), 2 (Warcries), 3 (Item row with Teleport)
+      expect(tpCell!.visualRow).toBe(3)
+    })
+  })
+
+  // =========================================================================
+  // 4. Intra-Row Ordering
+  // =========================================================================
+  describe('4. Intra-Row Ordering', () => {
+    it('strictly sorts skills within each row by reqlevel ascending, then skillId ascending', () => {
+      for (const cls of CHARACTER_CLASS_CODES) {
+        const classSkills = createClassSkillEntries(SKILLS_BY_CLASS[cls])
+        hud.setAvailableSkills([...DEFAULT_UNIVERSAL_SKILLS, ...classSkills])
+
+        for (const side of ['left', 'right'] as const) {
+          const cells = hud.getPopupCells(side)
+          // Group cells by visualRow
+          const rows = new Map<number, (typeof cells)[number][]>()
+          for (const c of cells) {
+            let list = rows.get(c.visualRow)
+            if (!list) {
+              list = []
+              rows.set(c.visualRow, list)
+            }
+            list.push(c)
+          }
+
+          for (const rowCells of rows.values()) {
+            for (let i = 0; i < rowCells.length - 1; i++) {
+              const a = rowCells[i]
+              const b = rowCells[i + 1]
+              const reqA = getSkillReqLevel(a.skill)
+              const reqB = getSkillReqLevel(b.skill)
+
+              if (reqA === reqB) {
+                expect(a.skill.skillId).toBeLessThan(b.skill.skillId)
+              } else {
+                expect(reqA).toBeLessThan(reqB)
+              }
+              // Verify column index is sequential 0, 1, 2...
+              expect(a.col).toBe(i)
+              expect(b.col).toBe(i + 1)
+            }
+          }
+        }
+      }
+    })
+  })
+
+  // =========================================================================
+  // 5. Adaptive Alignment & Canvas Bounds Clamping
+  // =========================================================================
+  describe('5. Adaptive Alignment & Canvas Bounds Clamping', () => {
+    it('expands left speedbar rightward and right speedbar leftward', () => {
+      hud.setAvailableSkills([...DEFAULT_SORCERESS_SKILLS])
+
+      const leftCells = hud.getPopupCells('left')
+      const rightCells = hud.getPopupCells('right')
+
+      // In left popup, col 0 is at base.x (117), col 1 is at 117 + 48 = 165
+      const leftRow0 = leftCells.filter(c => c.visualRow === 0)
+      if (leftRow0.length >= 2) {
+        expect(leftRow0[0].x).toBe(LEFT_SKILL_BOUNDS.x)
+        expect(leftRow0[1].x).toBe(LEFT_SKILL_BOUNDS.x + 48)
+      }
+
+      // In right popup, col 0 is at base.x (635), col 1 is at 635 - 48 = 587
+      const rightRow0 = rightCells.filter(c => c.visualRow === 0)
+      if (rightRow0.length >= 2) {
+        expect(rightRow0[0].x).toBe(RIGHT_SKILL_BOUNDS.x)
+        expect(rightRow0[1].x).toBe(RIGHT_SKILL_BOUNDS.x - 48)
+      }
+    })
+
+    it('strictly clamps all cells within [0, 800 - 48] and [0, 600 - 48]', () => {
+      // Simulate extreme row with 25 skills
+      const megaSkills: HotkeySkillEntry[] = []
+      for (let i = 1; i <= 25; i++) {
+        megaSkills.push({
+          skillId: 1000 + i,
+          name: `Custom Skill ${i}`,
+          nameZh: `自定义技能 ${i}`,
+          level: 1,
+          manaCost: 10,
+          leftUsable: true,
+          rightUsable: true,
+          tabIndex: 0,
+          reqlevel: i,
+        })
+      }
+      hud.setAvailableSkills(megaSkills)
+
+      for (const side of ['left', 'right'] as const) {
+        const cells = hud.getPopupCells(side)
+        for (const cell of cells) {
+          expect(cell.x).toBeGreaterThanOrEqual(0)
+          expect(cell.x).toBeLessThanOrEqual(800 - 48)
+          expect(cell.y).toBeGreaterThanOrEqual(0)
+          expect(cell.y).toBeLessThanOrEqual(600 - 48)
+        }
+      }
+    })
+  })
+
+  // =========================================================================
+  // 6. Item Skills & Tooltips
+  // =========================================================================
+  describe('6. Item Skills & Tooltips', () => {
+    it('positions item skills at the top row (ListRow = 4)', () => {
+      const skillsWithItems: HotkeySkillEntry[] = [
+        ...DEFAULT_SORCERESS_SKILLS,
+        { skillId: 219, name: 'Scroll of Town Portal', nameZh: '城镇传送卷轴', level: 1, manaCost: 0, isItemSkill: true, leftUsable: false, rightUsable: true },
+        { skillId: 217, name: 'Scroll of Identify', nameZh: '辨识卷轴', level: 1, manaCost: 0, isItemSkill: true, leftUsable: false, rightUsable: true },
+      ]
+      hud.setAvailableSkills(skillsWithItems)
+
+      const rightCells = hud.getPopupCells('right')
+      const itemCells = rightCells.filter(c => c.listRow === 4)
+      expect(itemCells.length).toBe(2)
+
+      const maxVisualRow = Math.max(...rightCells.map(c => c.visualRow))
+      for (const cell of itemCells) {
+        expect(cell.visualRow).toBe(maxVisualRow)
+      }
+    })
+
+    it('formats tooltips correctly for Town Portal, Identify, and Left Hand Throw', () => {
+      hud.setSkillCharges(219, 12, 20)
+      const tpLines = hud.formatTooltipLines(219, 'right', true)
+      expect(tpLines[0].text).toContain('城镇传送卷轴')
+      expect(tpLines.some(l => l.text.includes('12'))).toBe(true)
+
+      hud.setSkillCharges(218, 20, 20)
+      const idLines = hud.formatTooltipLines(218, 'right', true)
+      expect(idLines[0].text).toContain('辨识之书')
+      expect(idLines.some(l => l.text.includes('20'))).toBe(true)
+
+      const lhtLines = hud.formatTooltipLines(4, 'left', true)
+      expect(lhtLines[0].text).toContain('左手投掷')
+    })
+  })
+
+  // =========================================================================
+  // 7. Interactive Assignments & Guardrails
+  // =========================================================================
+  describe('7. Interactive Assignments & Guardrails', () => {
+    beforeEach(() => {
+      hud.setAvailableSkills([...DEFAULT_SORCERESS_SKILLS])
+    })
+
+    it('rejects assigning Meteor (56) and Blizzard (59) to left slot', () => {
+      expect(hud.assignSkill('left', 56)).toBe(false)
+      expect(hud.assignSkill('left', 59)).toBe(false)
+      expect(hud.leftSkillId).not.toBe(56)
+      expect(hud.leftSkillId).not.toBe(59)
+
+      // Right slot succeeds
+      expect(hud.assignSkill('right', 56)).toBe(true)
+      expect(hud.rightSkillId).toBe(56)
+      expect(hud.assignSkill('right', 59)).toBe(true)
+      expect(hud.rightSkillId).toBe(59)
+    })
+
+    it('rejects assigning auras to left slot', () => {
+      expect(hud.assignSkill('left', 113)).toBe(false) // Holy Freeze
+      expect(hud.leftSkillId).not.toBe(113)
+
+      expect(hud.assignSkill('right', 113)).toBe(true)
+      expect(hud.rightSkillId).toBe(113)
+    })
+
+    it('rejects assigning passive skills to any slot', () => {
+      expect(hud.assignSkill('left', 61)).toBe(false)  // Fire Mastery
+      expect(hud.assignSkill('right', 61)).toBe(false) // Fire Mastery
+      expect(hud.assignSkill('left', 127)).toBe(false) // Sword Mastery
+      expect(hud.assignSkill('right', 127)).toBe(false)
+    })
+
+    it('enforces left-usability on setDualSkill', () => {
+      expect(hud.setDualSkill(0)).toBe(true) // Attack
+      expect(hud.leftSkillId).toBe(0)
+      expect(hud.rightSkillId).toBe(0)
+
+      expect(hud.setDualSkill(56)).toBe(false) // Meteor
+      expect(hud.setDualSkill(113)).toBe(false) // Holy Freeze
+    })
+
+    it('handles speedbar popup opening, cell click selection, and slot closing', () => {
+      expect(hud.openPopup).toBeNull()
+
+      // 1. Click Left Slot opens left popup
+      const leftBounds = LEFT_SKILL_BOUNDS
+      hud.handleClick(leftBounds.x + 10, leftBounds.y + 10)
+      expect(hud.openPopup).toBe('left')
+
+      // 2. Select a cell in left popup (e.g. Fire Ball 47)
+      const leftCells = hud.getPopupCells('left')
+      const fbCell = leftCells.find(c => c.skill.skillId === 47)!
+      expect(fbCell).toBeDefined()
+
+      hud.handleClick(fbCell.x + 5, fbCell.y + 5)
+      expect(hud.leftSkillId).toBe(47)
+      expect(hud.openPopup).toBeNull()
+
+      // 3. Click Right Slot opens right popup
+      const rightBounds = RIGHT_SKILL_BOUNDS
+      hud.handleClick(rightBounds.x + 10, rightBounds.y + 10)
+      expect(hud.openPopup).toBe('right')
+
+      // 4. Select Blizzard (59) in right popup
+      const rightCells = hud.getPopupCells('right')
+      const blizCell = rightCells.find(c => c.skill.skillId === 59)!
+      expect(blizCell).toBeDefined()
+
+      hud.handleClick(blizCell.x + 5, blizCell.y + 5)
+      expect(hud.rightSkillId).toBe(59)
+      expect(hud.openPopup).toBeNull()
+    })
+  })
+})