diff --git a/frontend/src/__tests__/pr27Features.test.js b/frontend/src/__tests__/pr27Features.test.js
index aa41519..4aa015e 100644
--- a/frontend/src/__tests__/pr27Features.test.js
+++ b/frontend/src/__tests__/pr27Features.test.js
@@ -1,5 +1,6 @@
 import { describe, it, expect } from 'vitest'
 import { recipeNameEn, oilEn } from '../composables/useOilTranslation'
+import { matchesPinyinInitials, getPinyinInitials } from '../composables/usePinyinMatch'
 
 // ---------------------------------------------------------------------------
 // EDITOR_ONLY_TAGS includes '已下架'
@@ -283,3 +284,95 @@ describe('one-time username change guard', () => {
     expect(!!user.username_changed).toBe(false)
   })
 })
+
+// ---------------------------------------------------------------------------
+// Pinyin matching — PR29 extended coverage
+// ---------------------------------------------------------------------------
+describe('pinyin matching — extended oil names', () => {
+  it('matches mlk → 麦卢卡', () => {
+    expect(matchesPinyinInitials('麦卢卡', 'mlk')).toBe(true)
+  })
+
+  it('matches tx → 檀香', () => {
+    expect(matchesPinyinInitials('檀香', 'tx')).toBe(true)
+  })
+
+  it('matches xm → 香茅', () => {
+    expect(matchesPinyinInitials('香茅', 'xm')).toBe(true)
+  })
+
+  it('matches gbxz → 古巴香脂', () => {
+    expect(matchesPinyinInitials('古巴香脂', 'gbxz')).toBe(true)
+  })
+
+  it('matches my → 没药', () => {
+    expect(matchesPinyinInitials('没药', 'my')).toBe(true)
+  })
+
+  it('matches xhx → 小茴香', () => {
+    expect(matchesPinyinInitials('小茴香', 'xhx')).toBe(true)
+  })
+
+  it('matches jybh → 椒样薄荷', () => {
+    expect(matchesPinyinInitials('椒样薄荷', 'jybh')).toBe(true)
+  })
+
+  it('matches xbynz → 西班牙牛至', () => {
+    expect(matchesPinyinInitials('西班牙牛至', 'xbynz')).toBe(true)
+  })
+
+  it('matches sc → 顺畅呼吸 prefix', () => {
+    expect(matchesPinyinInitials('顺畅呼吸', 'sc')).toBe(true)
+  })
+
+  it('does not match wrong initials', () => {
+    expect(matchesPinyinInitials('麦卢卡', 'abc')).toBe(false)
+  })
+
+  it('getPinyinInitials returns correct string', () => {
+    expect(getPinyinInitials('麦卢卡')).toBe('mlk')
+    expect(getPinyinInitials('檀香')).toBe('tx')
+    expect(getPinyinInitials('没药')).toBe('my')
+  })
+})
+
+// ---------------------------------------------------------------------------
+// Viewer tag visibility — PR29
+// ---------------------------------------------------------------------------
+describe('viewer tag visibility logic', () => {
+  const EDITOR_ONLY_TAGS_VAL = ['已审核', '已下架']
+
+  it('editor sees all tags', () => {
+    const allTags = ['美容', '儿童', '已审核', '已下架']
+    const canEdit = true
+    const visible = canEdit ? allTags : []
+    expect(visible).toEqual(allTags)
+  })
+
+  it('viewer sees no public tags', () => {
+    const canEdit = false
+    const myDiary = [
+      { tags: ['我的标签'] },
+      { tags: ['我的标签', '另一个'] },
+    ]
+    // Viewer: collect tags from own diary only
+    const myTags = new Set()
+    for (const d of myDiary) {
+      for (const t of (d.tags || [])) myTags.add(t)
+    }
+    const visible = canEdit ? ['美容', '已审核'] : [...myTags]
+    expect(visible).toContain('我的标签')
+    expect(visible).toContain('另一个')
+    expect(visible).not.toContain('美容')
+    expect(visible).not.toContain('已审核')
+  })
+
+  it('viewer with no diary tags sees empty', () => {
+    const myDiary = []
+    const myTags = new Set()
+    for (const d of myDiary) {
+      for (const t of (d.tags || [])) myTags.add(t)
+    }
+    expect([...myTags]).toHaveLength(0)
+  })
+})