feat: 添加 napi 包测试覆盖与 stub 改进

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/modifiers-napi/src/__tests__/index.test.ts

@@ -0,0 +1,112 @@
+import { afterEach, beforeEach, describe, expect, mock, test } from 'bun:test'
+
+let ffiShouldThrow = false
+let nativeFlags = 0
+let dlopenCalls = 0
+
+mock.module('bun:ffi', () => ({
+  FFIType: {
+    i32: 0,
+    u64: 0,
+  },
+  dlopen: () => {
+    dlopenCalls++
+    if (ffiShouldThrow) {
+      throw new Error('ffi load failed')
+    }
+    return {
+      symbols: {
+        CGEventSourceFlagsState: () => nativeFlags,
+      },
+    }
+  },
+}))
+
+const originalPlatform = process.platform
+
+async function loadModule() {
+  return import(`../index.ts?case=${Math.random()}`)
+}
+
+beforeEach(() => {
+  ffiShouldThrow = false
+  nativeFlags = 0
+  dlopenCalls = 0
+  Object.defineProperty(process, 'platform', {
+    value: originalPlatform,
+    configurable: true,
+  })
+})
+
+afterEach(() => {
+  Object.defineProperty(process, 'platform', {
+    value: originalPlatform,
+    configurable: true,
+  })
+})
+
+describe('modifiers-napi', () => {
+  test('returns false for non-darwin platforms', async () => {
+    Object.defineProperty(process, 'platform', {
+      value: 'win32',
+      configurable: true,
+    })
+    const mod = await loadModule()
+
+    await mod.prewarm()
+    expect(dlopenCalls).toBe(0)
+    expect(mod.isModifierPressed('shift')).toBe(false)
+    expect(mod.isModifierPressed('command')).toBe(false)
+  })
+
+  test('prewarm is idempotent on darwin', async () => {
+    Object.defineProperty(process, 'platform', {
+      value: 'darwin',
+      configurable: true,
+    })
+    const mod = await loadModule()
+
+    await mod.prewarm()
+    await mod.prewarm()
+
+    expect(dlopenCalls).toBe(1)
+  })
+
+  test('returns false when ffi loading fails on darwin', async () => {
+    Object.defineProperty(process, 'platform', {
+      value: 'darwin',
+      configurable: true,
+    })
+    ffiShouldThrow = true
+    const mod = await loadModule()
+
+    await mod.prewarm()
+    expect(mod.isModifierPressed('shift')).toBe(false)
+  })
+
+  test('returns false for unknown modifier names on darwin', async () => {
+    Object.defineProperty(process, 'platform', {
+      value: 'darwin',
+      configurable: true,
+    })
+    nativeFlags = 0x20000
+    const mod = await loadModule()
+
+    await mod.prewarm()
+    expect(mod.isModifierPressed('unknown')).toBe(false)
+  })
+
+  test('uses native flag bits for known modifiers on darwin', async () => {
+    Object.defineProperty(process, 'platform', {
+      value: 'darwin',
+      configurable: true,
+    })
+    nativeFlags = 0x20000 | 0x40000
+    const mod = await loadModule()
+
+    await mod.prewarm()
+    expect(mod.isModifierPressed('shift')).toBe(true)
+    expect(mod.isModifierPressed('control')).toBe(true)
+    expect(mod.isModifierPressed('option')).toBe(false)
+  })
+})