189 lines
7.6 KiB
Markdown
189 lines
7.6 KiB
Markdown
# Phase 16 — 零依赖纯函数测试
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> 创建日期：2026-04-02
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> 预计：+120 tests / 8 files
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> 目标：覆盖所有零外部依赖的纯函数/类模块
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所有模块均为纯函数或零外部依赖类，mock 成本为零，ROI 最高。
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---
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## 16.1 `src/utils/__tests__/stream.test.ts`（~15 tests）
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**目标模块**: `src/utils/stream.ts`（76 行）
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**导出**: `Stream<T>` class — 手动异步队列，实现 `AsyncIterator<T>`
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| 测试用例 | 验证点 |
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|---------|--------|
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| enqueue then read | 单条消息正确传递 |
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| enqueue multiple then drain | 多条消息顺序消费 |
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| done resolves pending readers | `done()` 后迭代结束 |
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| done with no pending readers | 无等待时安全关闭 |
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| error rejects pending readers | `error(e)` 传播异常 |
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| error after done | 后续操作安全处理 |
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| single-iteration guard | `return()` 后不可再迭代 |
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| empty stream done immediately | 无数据时 done 返回 `{ done: true }` |
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| concurrent enqueue | 多次 enqueue 不丢失 |
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| backpressure | reader 慢于 writer 时不丢数据 |
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---
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## 16.2 `src/utils/__tests__/abortController.test.ts`（~12 tests）
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**目标模块**: `src/utils/abortController.ts`（99 行）
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**导出**: `createAbortController()`, `createChildAbortController()`
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| 测试用例 | 验证点 |
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|---------|--------|
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| parent abort propagates to child | `parent.abort()` → child aborted |
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| child abort does NOT propagate to parent | `child.abort()` → parent still active |
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| already-aborted parent → child immediately aborted | 创建时即继承 abort 状态 |
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| child listener cleanup after parent abort | WeakRef 回收后无泄漏 |
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| multiple children of same parent | 独立 abort 传播 |
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| child abort then parent abort | 顺序无关 |
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| signal.maxListeners raised | MaxListenersExceededWarning 不触发 |
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---
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## 16.3 `src/utils/__tests__/bufferedWriter.test.ts`（~14 tests）
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**目标模块**: `src/utils/bufferedWriter.ts`（100 行）
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**导出**: `createBufferedWriter()`
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| 测试用例 | 验证点 |
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|---------|--------|
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| single write buffered | write → buffer 累积 |
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| flush on size threshold | 超过 maxSize 时自动 flush |
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| flush on timer | 定时器触发 flush |
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| immediate mode | `{ immediate: true }` 跳过缓冲 |
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| overflow coalescing | overflow 内容合并到下次 flush |
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| empty buffer flush | 无数据时 flush 无副作用 |
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| close flushes remaining | close 触发最终 flush |
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| multiple writes before flush | 批量写入合并 |
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| flush callback receives concatenated data | writeFn 参数正确 |
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**Mock**: 注入 `writeFn` 回调，可选 fake timers
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---
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## 16.4 `src/utils/__tests__/gitDiff.test.ts`（~20 tests）
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**目标模块**: `src/utils/gitDiff.ts`（532 行）
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**可测函数**: `parseGitNumstat()`, `parseGitDiff()`, `parseShortstat()`
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| 测试用例 | 验证点 |
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|---------|--------|
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| parseGitNumstat — single file | `1\t2\tpath` → { added: 1, deleted: 2, file: "path" } |
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| parseGitNumstat — binary file | `-\t-\timage.png` → binary flag |
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| parseGitNumstat — rename | `{ old => new }` 格式解析 |
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| parseGitNumstat — empty diff | 空字符串 → [] |
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| parseGitNumstat — multiple files | 多行正确分割 |
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| parseGitDiff — added lines | `+` 开头行计数 |
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| parseGitDiff — deleted lines | `-` 开头行计数 |
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| parseGitDiff — hunk header | `@@ -a,b +c,d @@` 解析 |
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| parseGitDiff — new file mode | `new file mode 100644` 检测 |
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| parseGitDiff — deleted file mode | `deleted file mode` 检测 |
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| parseGitDiff — binary diff | Binary files differ 处理 |
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| parseShortstat — all components | `1 file changed, 5 insertions(+), 3 deletions(-)` |
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| parseShortstat — insertions only | 无 deletions |
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| parseShortstat — deletions only | 无 insertions |
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| parseShortstat — files only | 仅 file changed |
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| parseShortstat — empty | 空字符串 → 默认值 |
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| parseShortstat — rename | `1 file changed, ...` 重命名 |
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**Mock**: 无需 mock — 全部是纯字符串解析
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---
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## 16.5 `src/__tests__/history.test.ts`（~18 tests）
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**目标模块**: `src/history.ts`（464 行）
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**可测函数**: `parseReferences()`, `expandPastedTextRefs()`, `formatPastedTextRef()`, `formatImageRef()`, `getPastedTextRefNumLines()`
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| 测试用例 | 验证点 |
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|---------|--------|
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| parseReferences — text ref | `#1` → [{ type: "text", ref: 1 }] |
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| parseReferences — image ref | `@1` → [{ type: "image", ref: 1 }] |
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| parseReferences — multiple refs | `#1 #2 @3` → 3 refs |
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| parseReferences — no refs | `"hello"` → [] |
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| parseReferences — duplicate refs | `#1 #1` → 去重或保留 |
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| parseReferences — zero ref | `#0` → 边界 |
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| parseReferences — large ref | `#999` → 正常 |
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| formatPastedTextRef — basic | 输出格式验证 |
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| formatPastedTextRef — multiline | 多行内容格式 |
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| getPastedTextRefNumLines — 1 line | 返回 1 |
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| getPastedTextRefNumLines — multiple lines | 换行计数 |
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| expandPastedTextRefs — single ref | 替换单个引用 |
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| expandPastedTextRefs — multiple refs | 替换多个引用 |
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| expandPastedTextRefs — no refs | 原样返回 |
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| expandPastedTextRefs — mixed content | 文本 + 引用混合 |
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| formatImageRef — basic | 输出格式 |
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**Mock**: `mock.module("src/bootstrap/state.ts", ...)` 解锁模块
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---
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## 16.6 `src/utils/__tests__/sliceAnsi.test.ts`（~16 tests）
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**目标模块**: `src/utils/sliceAnsi.ts`（91 行）
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**导出**: `sliceAnsi()` — ANSI 感知的字符串切片
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| 测试用例 | 验证点 |
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|---------|--------|
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| plain text slice | `"hello".slice(1,3)` 等价 |
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| preserve ANSI codes | `\x1b[31mhello\x1b[0m` 切片后保留颜色 |
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| close opened styles | 切片点在 ANSI 样式中间时正确关闭 |
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| hyperlink handling | OSC 8 超链接不被切断 |
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| combining marks (diacritics) | `é` = `e\u0301` 不被切开 |
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| Devanagari matras | 零宽字符不被切断 |
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| full-width characters | CJK 字符宽度 = 2 |
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| empty slice | 返回空字符串 |
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| full slice | 返回完整字符串 |
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| boundary at ANSI code | 边界恰好在 escape 序列上 |
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| nested ANSI styles | 多层嵌套时正确处理 |
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| slice start > end | 空结果 |
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**Mock**: `mock.module("@alcalzone/ansi-tokenize", ...)`, `mock.module("ink/stringWidth", ...)`
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---
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## 16.7 `src/utils/__tests__/treeify.test.ts`（~15 tests）
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**目标模块**: `src/utils/treeify.ts`（170 行）
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**导出**: `treeify()` — 递归树渲染
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| 测试用例 | 验证点 |
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|---------|--------|
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| simple flat tree | `{ a: {}, b: {} }` → 2 行 |
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| nested tree | `{ a: { b: { c: {} } } }` → 3 行缩进 |
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| array values | `[1, 2, 3]` 渲染为列表 |
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| circular reference | 不无限递归 |
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| empty object | `{}` 处理 |
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| single key | 布局适配 |
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| branch vs last-branch character | ├─ vs └─ |
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| custom prefix | options 前缀传递 |
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| deep nesting | 5+ 层缩进正确 |
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| mixed object/array | 混合结构 |
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**Mock**: `mock.module("figures", ...)`, color 模块 mock
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---
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## 16.8 `src/utils/__tests__/words.test.ts`（~10 tests）
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**目标模块**: `src/utils/words.ts`（800 行，大部分是词表数据）
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**导出**: `generateWordSlug()`, `generateShortWordSlug()`
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| 测试用例 | 验证点 |
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|---------|--------|
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| generateWordSlug format | `adjective-verb-noun` 三段式 |
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| generateShortWordSlug format | `adjective-noun` 两段式 |
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| all parts non-empty | 无空段 |
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| hyphen separator | `-` 分隔 |
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| all parts from word lists | 成分来自预定义词表 |
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| multiple calls uniqueness | 连续调用不总是相同 |
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| no consecutive hyphens | 无 `--` |
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| lowercase only | 全小写 |
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**Mock**: `mock.module("crypto", ...)` 控制 `randomBytes` 实现确定性测试
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