feat: CoC 7e d100 rule-pack

tests/dice/coc-d100.test.js

@@ -0,0 +1,32 @@
+import { describe, it, expect } from 'vitest';
+import { cocD100 } from '../../src/dice/rulepacks/coc-d100.js';
+import { getRulePack } from '../../src/dice/rulepacks/index.js';
+
+const roll = (v) => [{ sides: 100, value: v }];
+
+describe('coc-d100 rule-pack', () => {
+  it('grades a roll against a 50% skill', () => {
+    expect(cocD100.interpret(roll(1), { target: 50 }).level).toBe('critical');
+    expect(cocD100.interpret(roll(10), { target: 50 }).level).toBe('extreme');  // <= 10
+    expect(cocD100.interpret(roll(25), { target: 50 }).level).toBe('hard');     // <= 25
+    expect(cocD100.interpret(roll(50), { target: 50 }).level).toBe('success');
+    expect(cocD100.interpret(roll(51), { target: 50 }).level).toBe('failure');
+    expect(cocD100.interpret(roll(100), { target: 50 }).level).toBe('fumble');
+  });
+  it('fumbles on 96+ when the skill is under 50', () => {
+    expect(cocD100.interpret(roll(96), { target: 40 }).level).toBe('fumble');
+    expect(cocD100.interpret(roll(41), { target: 40 }).level).toBe('failure');
+  });
+  it('marks the four passing bands as success', () => {
+    expect(cocD100.interpret(roll(10), { target: 50 }).success).toBe(true);
+    expect(cocD100.interpret(roll(51), { target: 50 }).success).toBe(false);
+  });
+  it('defaults target to 50 and summarises', () => {
+    const v = cocD100.interpret(roll(5));
+    expect(v.target).toBe(50);
+    expect(cocD100.summary(v)).toBe('5 vs 50% → EXTREME');
+  });
+  it('is registered', () => {
+    expect(getRulePack('coc-d100')).toBe(cocD100);
+  });
+});