diff --git a/vscode/package.json b/vscode/package.json
index a4f701c..044d7a9 100644
--- a/vscode/package.json
+++ b/vscode/package.json
@@ -115,6 +115,24 @@
         "category": "代码阅读",
         "icon": "$(git-commit)"
       },
+      {
+        "command": "superpowers.codeReader.hideTests",
+        "title": "隐藏测试文件",
+        "category": "代码阅读",
+        "icon": "$(beaker-stop)"
+      },
+      {
+        "command": "superpowers.codeReader.showTests",
+        "title": "显示测试文件",
+        "category": "代码阅读",
+        "icon": "$(beaker)"
+      },
+      {
+        "command": "superpowers.codeReader.stage",
+        "title": "暂存",
+        "category": "代码阅读",
+        "icon": "$(add)"
+      },
       {
         "command": "superpowers.codeReader.showAllFiles",
         "title": "显示全部",
@@ -215,7 +233,7 @@
       "superpowers.codeReader.copy": [
         {
           "command": "superpowers.codeReader.copyFileName",
-          "when": "view == superpowers.codeReader.files && viewItem =~ /^file( noted)?$/",
+          "when": "view == superpowers.codeReader.files && viewItem =~ /^file( unstaged)?( noted)?$/",
           "group": "copy@1"
         },
         {
@@ -225,17 +243,17 @@
         },
         {
           "command": "superpowers.codeReader.copyFileStem",
-          "when": "view == superpowers.codeReader.files && viewItem =~ /^file( noted)?$/",
+          "when": "view == superpowers.codeReader.files && viewItem =~ /^file( unstaged)?( noted)?$/",
           "group": "copy@2"
         },
         {
           "command": "superpowers.codeReader.copyRelativePath",
-          "when": "view == superpowers.codeReader.files && viewItem =~ /^(file|folder)( noted)?$/",
+          "when": "view == superpowers.codeReader.files && viewItem =~ /^(file( unstaged)?|folder)( noted)?$/",
           "group": "copy@3"
         },
         {
           "command": "superpowers.codeReader.copyAbsolutePath",
-          "when": "view == superpowers.codeReader.files && viewItem =~ /^(file|folder)( noted)?$/",
+          "when": "view == superpowers.codeReader.files && viewItem =~ /^(file( unstaged)?|folder)( noted)?$/",
           "group": "copy@4"
         }
       ],
@@ -265,36 +283,51 @@
           "when": "view == superpowers.codeReader.files",
           "group": "navigation@2"
         },
+        {
+          "command": "superpowers.codeReader.hideTests",
+          "when": "view == superpowers.codeReader.files && superpowers.codeReader.filter == uncommitted && !superpowers.codeReader.testsHidden",
+          "group": "navigation@3"
+        },
+        {
+          "command": "superpowers.codeReader.showTests",
+          "when": "view == superpowers.codeReader.files && superpowers.codeReader.filter == uncommitted && superpowers.codeReader.testsHidden",
+          "group": "navigation@3"
+        },
         {
           "command": "superpowers.codeReader.showAllFiles",
           "when": "view == superpowers.codeReader.files && superpowers.codeReader.filter",
-          "group": "navigation@3"
+          "group": "navigation@4"
         },
         {
           "command": "superpowers.codeReader.refresh",
           "when": "view == superpowers.codeReader.files",
-          "group": "navigation@4"
+          "group": "navigation@5"
         }
       ],
       "view/item/context": [
         {
           "submenu": "superpowers.codeReader.copy",
-          "when": "view == superpowers.codeReader.files && viewItem =~ /^(file|folder)( noted)?$/",
+          "when": "view == superpowers.codeReader.files && viewItem =~ /^(file( unstaged)?|folder)( noted)?$/",
           "group": "inline@1"
         },
         {
           "command": "superpowers.codeReader.addNote",
-          "when": "view == superpowers.codeReader.files && superpowers.codeReader.filter != review && viewItem =~ /^(file|folder)$/",
+          "when": "view == superpowers.codeReader.files && superpowers.codeReader.filter != review && viewItem =~ /^(file( unstaged)?|folder)$/",
           "group": "inline@2"
         },
         {
           "command": "superpowers.codeReader.editNote",
-          "when": "view == superpowers.codeReader.files && superpowers.codeReader.filter != review && viewItem =~ /^(file|folder) noted$/",
+          "when": "view == superpowers.codeReader.files && superpowers.codeReader.filter != review && viewItem =~ /^(file( unstaged)?|folder) noted$/",
           "group": "inline@2"
         },
+        {
+          "command": "superpowers.codeReader.stage",
+          "when": "view == superpowers.codeReader.files && superpowers.codeReader.filter == uncommitted && viewItem =~ /^file unstaged( noted)?$/",
+          "group": "inline@3"
+        },
         {
           "command": "superpowers.codeReader.copyFileName",
-          "when": "view == superpowers.codeReader.files && viewItem =~ /^file( noted)?$/",
+          "when": "view == superpowers.codeReader.files && viewItem =~ /^file( unstaged)?( noted)?$/",
           "group": "copy@1"
         },
         {
@@ -304,27 +337,27 @@
         },
         {
           "command": "superpowers.codeReader.copyFileStem",
-          "when": "view == superpowers.codeReader.files && viewItem =~ /^file( noted)?$/",
+          "when": "view == superpowers.codeReader.files && viewItem =~ /^file( unstaged)?( noted)?$/",
           "group": "copy@2"
         },
         {
           "command": "superpowers.codeReader.copyRelativePath",
-          "when": "view == superpowers.codeReader.files && viewItem =~ /^(file|folder)( noted)?$/",
+          "when": "view == superpowers.codeReader.files && viewItem =~ /^(file( unstaged)?|folder)( noted)?$/",
           "group": "copy@3"
         },
         {
           "command": "superpowers.codeReader.copyAbsolutePath",
-          "when": "view == superpowers.codeReader.files && viewItem =~ /^(file|folder)( noted)?$/",
+          "when": "view == superpowers.codeReader.files && viewItem =~ /^(file( unstaged)?|folder)( noted)?$/",
           "group": "copy@4"
         },
         {
           "command": "superpowers.codeReader.addNote",
-          "when": "view == superpowers.codeReader.files && superpowers.codeReader.filter != review && viewItem =~ /^(file|folder)$/",
+          "when": "view == superpowers.codeReader.files && superpowers.codeReader.filter != review && viewItem =~ /^(file( unstaged)?|folder)$/",
           "group": "notes"
         },
         {
           "command": "superpowers.codeReader.editNote",
-          "when": "view == superpowers.codeReader.files && superpowers.codeReader.filter != review && viewItem =~ /^(file|folder) noted$/",
+          "when": "view == superpowers.codeReader.files && superpowers.codeReader.filter != review && viewItem =~ /^(file( unstaged)?|folder) noted$/",
           "group": "notes"
         }
       ],
@@ -349,6 +382,18 @@
           "command": "superpowers.codeReader.showAllFiles",
           "when": "superpowers.codeReader.filter"
         },
+        {
+          "command": "superpowers.codeReader.hideTests",
+          "when": "superpowers.codeReader.filter == uncommitted && !superpowers.codeReader.testsHidden"
+        },
+        {
+          "command": "superpowers.codeReader.showTests",
+          "when": "superpowers.codeReader.filter == uncommitted && superpowers.codeReader.testsHidden"
+        },
+        {
+          "command": "superpowers.codeReader.stage",
+          "when": "false"
+        },
         {
           "command": "superpowers.codeReader.showPreview",
           "when": "activeEditor == workbench.editors.files.textFileEditor && (resourceLangId =~ /^(typescript|typescriptreact|javascript|javascriptreact|python|shellscript|dockerfile)$/ || resourceLangId in superpowers.codeReader.languageIds)"
diff --git a/vscode/src/codeReader/explorer/fileEntries.test.ts b/vscode/src/codeReader/explorer/fileEntries.test.ts
index 37ab37f..61c4445 100644
--- a/vscode/src/codeReader/explorer/fileEntries.test.ts
+++ b/vscode/src/codeReader/explorer/fileEntries.test.ts
@@ -28,6 +28,12 @@ describe('行的 contextValue', () => {
     expect(entryContext({ isDirectory: true, isRoot: false })).toBe('folder')
     expect(entryContext({ isDirectory: false, isRoot: false })).toBe('file')
   })
+
+  it('文件行可以带标记（「更改」区能暂存的 file unstaged），目录、根不带', () => {
+    expect(entryContext({ isDirectory: false, isRoot: false }, 'unstaged')).toBe('file unstaged')
+    expect(entryContext({ isDirectory: true, isRoot: false }, 'unstaged')).toBe('folder')
+    expect(entryContext({ isDirectory: true, isRoot: true }, 'unstaged')).toBe('root')
+  })
 })
 
 describe('files.exclude', () => {
diff --git a/vscode/src/codeReader/explorer/fileEntries.ts b/vscode/src/codeReader/explorer/fileEntries.ts
index b601eb7..f089bac 100644
--- a/vscode/src/codeReader/explorer/fileEntries.ts
+++ b/vscode/src/codeReader/explorer/fileEntries.ts
@@ -12,9 +12,19 @@ export function sortEntries<T extends DirEntry>(entries: T[]): T[] {
     || (a.name < b.name ? -1 : a.name > b.name ? 1 : 0))
 }
 
-/** 树上一行的 contextValue：菜单的 when 子句按它分工作区根、目录、文件。 */
-export function entryContext(entry: { isDirectory: boolean, isRoot: boolean }): 'root' | 'folder' | 'file' {
-  return entry.isRoot ? 'root' : entry.isDirectory ? 'folder' : 'file'
+/** 分组行（「暂存的更改」「更改」）的 contextValue：不挂任何行菜单。 */
+export const GROUP_CONTEXT = 'group'
+
+/**
+ * 树上一行的 contextValue：菜单的 when 子句按它分工作区根、目录、文件。
+ * 文件行可以带一个标记（「更改」区里能暂存的是 `file unstaged`），菜单按它给这些行多挂按钮；目录、根不带。
+ */
+export function entryContext(entry: { isDirectory: boolean, isRoot: boolean }, fileMarker?: string): string {
+  if (entry.isRoot)
+    return 'root'
+  if (entry.isDirectory)
+    return 'folder'
+  return fileMarker ? `file ${fileMarker}` : 'file'
 }
 
 /** `files.exclude` 的值：true 排除；false 不排除；`{ when }` 只在有对应的兄弟文件时排除。 */
diff --git a/vscode/src/codeReader/explorer/fileTree.ts b/vscode/src/codeReader/explorer/fileTree.ts
index 0e19743..3682aad 100644
--- a/vscode/src/codeReader/explorer/fileTree.ts
+++ b/vscode/src/codeReader/explorer/fileTree.ts
@@ -3,7 +3,7 @@ import type { ChangedTree, FileChange } from './changedTree'
 import type { ExcludeSetting } from './fileEntries'
 import * as path from 'node:path'
 import { EventEmitter, FileType, ThemeIcon, TreeItem, TreeItemCollapsibleState, Uri, workspace } from 'vscode'
-import { createExcludeMatcher, entryContext, sortEntries } from './fileEntries'
+import { createExcludeMatcher, entryContext, GROUP_CONTEXT, sortEntries } from './fileEntries'
 
 export interface FileNode {
   uri: Uri
@@ -11,6 +11,8 @@ export interface FileNode {
   folder: WorkspaceFolder
   isDirectory: boolean
   isRoot: boolean
+  /** 只摆改动的文件时所在的分组；普通的树没有 */
+  section?: ChangedSection
   /** 只摆改动的文件时这个文件怎么改的；普通的树、目录没有 */
   change?: FileChange
 }
@@ -21,8 +23,29 @@ export interface ChangedRoot {
   tree: ChangedTree
 }
 
-/** 只摆改动的文件时树上摆什么：每个根一个根节点，下面只有改动的文件和通往它们的目录。 */
-export type ChangedFilesView = readonly ChangedRoot[]
+/** 只摆改动的文件时的一个分组：有 label 时画一行分组（名字后面淡色的 description），各个根摆在它下面；没有 label 时各个根直接摆在最上面。 */
+export interface ChangedSection {
+  label?: string
+  description?: string
+  /** 这一组里文件行的 contextValue 带的标记（见 entryContext），菜单按它给这些行多挂按钮 */
+  fileMarker?: string
+  roots: readonly ChangedRoot[]
+}
+
+/** 只摆改动的文件时树上摆什么：一个或几个分组，每组下面每个根一个根节点，再往下只有改动的文件和通往它们的目录。 */
+export type ChangedFilesView = readonly ChangedSection[]
+
+/** 分组行（「暂存的更改」「更改」）。 */
+export interface GroupNode {
+  group: ChangedSection
+}
+
+/** 树上的一行：分组行，或者目录 / 文件。 */
+export type TreeNode = GroupNode | FileNode
+
+export function isGroupNode(node: TreeNode): node is GroupNode {
+  return 'group' in node
+}
 
 /** 删掉的文件那一行的悬停提示：它已经不在了，点了打不开。 */
 const DELETED_TOOLTIP = '已删除，没有内容可打开'
@@ -39,18 +62,21 @@ const REFRESH_DELAY_MS = 300
 /**
  * 侧栏的工作区文件树：每个工作区文件夹一个根节点，只看和打开。
  * 节点用 resourceUri，图标、git 改动颜色都由 VS Code 按文件图标主题和 SCM 装饰自动加上。
- * 筛选时换成只摆改动的文件（showChanges：审查工单时 PR 改过的，未提交的更改时各仓库里没提交的）：目录全部展开，删掉的文件列出来但打不开。
+ * 筛选时换成只摆改动的文件（showChanges：审查工单时 PR 改过的，未提交的更改时各仓库里没提交的，分「暂存的更改」「更改」两组）：
+ * 目录全部展开，删掉的文件列出来但打不开。
  */
-export class FileTreeProvider implements TreeDataProvider<FileNode> {
+export class FileTreeProvider implements TreeDataProvider<TreeNode> {
   /** undefined 是整棵树重画，数组是只重画这几行 */
-  private readonly changed = new EventEmitter<FileNode[] | undefined>()
-  readonly onDidChangeTreeData: Event<FileNode[] | undefined> = this.changed.event
+  private readonly changed = new EventEmitter<TreeNode[] | undefined>()
+  readonly onDidChangeTreeData: Event<TreeNode[] | undefined> = this.changed.event
   private readonly disposables: { dispose: () => unknown }[]
-  /** 按 Uri 记下交给 VS Code 的节点：只重画几行时要交回同一个对象，VS Code 按对象认行。 */
-  private readonly nodes = new Map<string, FileNode>()
+  /** 按分组、Uri 记下交给 VS Code 的节点：只重画几行时要交回同一个对象，VS Code 按对象认行；同一个文件可以在几个分组里各有一行。 */
+  private readonly nodes = new Map<ChangedSection | undefined, Map<string, FileNode>>()
   private timer: NodeJS.Timeout | undefined
   /** 筛选时只摆的那些文件；undefined 是普通的工作区文件树 */
   private changes: ChangedFilesView | undefined
+  /** 筛选时每个分组的分组行 */
+  private groups: GroupNode[] = []
 
   /**
    * @param openCommand 点文件时执行的命令，参数是文件 Uri
@@ -80,9 +106,11 @@ export class FileTreeProvider implements TreeDataProvider<FileNode> {
     this.changed.fire(undefined)
   }
 
-  getTreeItem(node: FileNode): TreeItem {
+  getTreeItem(node: TreeNode): TreeItem {
+    if (isGroupNode(node))
+      return this.groupItem(node.group)
     const item = this.baseItem(node)
-    item.contextValue = entryContext(node)
+    item.contextValue = entryContext(node, node.section?.fileMarker)
     this.decorator.decorate(item, node)
     return item
   }
@@ -90,14 +118,17 @@ export class FileTreeProvider implements TreeDataProvider<FileNode> {
   /** 换成只摆改动的文件（undefined 回到工作区文件树），整棵树重画。 */
   showChanges(view: ChangedFilesView | undefined): void {
     this.changes = view
+    this.groups = (view ?? []).map(group => ({ group }))
     this.refresh()
   }
 
-  async getChildren(node?: FileNode): Promise<FileNode[]> {
+  async getChildren(node?: TreeNode): Promise<TreeNode[]> {
     if (this.changes)
-      return this.changedChildren(this.changes, node)
+      return this.changedChildren(node)
     if (!node)
       return (workspace.workspaceFolders ?? []).map(folder => this.nodeAt(folder.uri, folder, true, true))
+    if (isGroupNode(node))
+      return [] // 分组行只在只摆改动的文件时有
 
     let entries: [string, FileType][]
     try {
@@ -138,29 +169,49 @@ export class FileTreeProvider implements TreeDataProvider<FileNode> {
     return item
   }
 
-  private nodeAt(uri: Uri, folder: WorkspaceFolder, isDirectory: boolean, isRoot: boolean, change?: FileChange): FileNode {
+  /** 分组行：名字、后面淡色的 description，一直展开；contextValue 是 GROUP_CONTEXT，不挂行菜单。 */
+  private groupItem({ label, description }: ChangedSection): TreeItem {
+    const item = new TreeItem(label ?? '', TreeItemCollapsibleState.Expanded)
+    item.description = description
+    item.contextValue = GROUP_CONTEXT
+    return item
+  }
+
+  private nodeAt(uri: Uri, folder: WorkspaceFolder, isDirectory: boolean, isRoot: boolean, section?: ChangedSection, change?: FileChange): FileNode {
+    let nodes = this.nodes.get(section)
+    if (!nodes)
+      this.nodes.set(section, nodes = new Map())
     const id = uri.toString()
-    const known = this.nodes.get(id)
+    const known = nodes.get(id)
     if (known && known.folder === folder && known.isDirectory === isDirectory && known.isRoot === isRoot && known.change === change)
       return known
-    const node: FileNode = { uri, folder, isDirectory, isRoot, ...(change ? { change } : {}) }
-    this.nodes.set(id, node)
+    const node: FileNode = { uri, folder, isDirectory, isRoot, ...(section ? { section } : {}), ...(change ? { change } : {}) }
+    nodes.set(id, node)
     return node
   }
 
-  /** 只摆改动的文件时的一层：最上面是各个根，再往下只有改动的文件和通往它们的目录。 */
-  private changedChildren(roots: ChangedFilesView, node?: FileNode): FileNode[] {
+  /**
+   * 只摆改动的文件时的一层：最上面是分组行（没有名字的分组直接摆它的各个根），分组下面是各个根，
+   * 再往下只有改动的文件和通往它们的目录。
+   */
+  private changedChildren(node?: TreeNode): TreeNode[] {
     if (!node)
-      return roots.map(({ folder }) => this.nodeAt(folder.uri, folder, true, true))
-    const { folder } = node
-    const tree = roots.find(root => root.folder === folder)?.tree
+      return this.groups.flatMap((group): TreeNode[] => group.group.label !== undefined ? [group] : this.rootsOf(group.group))
+    if (isGroupNode(node))
+      return this.rootsOf(node.group)
+    const { folder, section } = node
+    const tree = section?.roots.find(root => root.folder === folder)?.tree
     const dir = path.posix.relative(folder.uri.path, node.uri.path)
-    return (tree?.get(dir) ?? []).map(entry => this.nodeAt(Uri.joinPath(folder.uri, entry.path), folder, entry.isDirectory, false, entry.change))
+    return (tree?.get(dir) ?? []).map(entry => this.nodeAt(Uri.joinPath(folder.uri, entry.path), folder, entry.isDirectory, false, section, entry.change))
+  }
+
+  private rootsOf(section: ChangedSection): FileNode[] {
+    return section.roots.map(({ folder }) => this.nodeAt(folder.uri, folder, true, true, section))
   }
 
   /** 还没展开过的行不用管，展开时自然按最新的画。 */
   private redraw(uris: readonly Uri[]): void {
-    const nodes = uris.flatMap(uri => this.nodes.get(uri.toString()) ?? [])
+    const nodes = uris.flatMap(uri => [...this.nodes.values()].flatMap(known => known.get(uri.toString()) ?? []))
     if (nodes.length > 0)
       this.changed.fire(nodes)
   }
diff --git a/vscode/src/codeReader/explorer/rowMenus.test.ts b/vscode/src/codeReader/explorer/rowMenus.test.ts
index da8f443..30a57ea 100644
--- a/vscode/src/codeReader/explorer/rowMenus.test.ts
+++ b/vscode/src/codeReader/explorer/rowMenus.test.ts
@@ -2,8 +2,9 @@ import { readFileSync } from 'node:fs'
 import * as path from 'node:path'
 import { describe, expect, it } from 'vitest'
 import { noteDecoration } from '../notes/noteItem'
+import { UNSTAGED_MARKER } from '../uncommitted/uncommittedFiles'
 import { COPY_COMMANDS } from './copyText'
-import { entryContext } from './fileEntries'
+import { entryContext, GROUP_CONTEXT } from './fileEntries'
 
 interface MenuItem { command?: string, submenu?: string, when: string, group?: string }
 interface Manifest {
@@ -23,6 +24,9 @@ const EDIT_NOTE = 'superpowers.codeReader.editNote'
 const file = entryContext({ isDirectory: false, isRoot: false })
 const folder = entryContext({ isDirectory: true, isRoot: false })
 const root = entryContext({ isDirectory: true, isRoot: true })
+/** 「未提交的更改」里「更改」组的文件行 */
+const unstaged = entryContext({ isDirectory: false, isRoot: false }, UNSTAGED_MARKER)
+const STAGE = 'superpowers.codeReader.stage'
 const noted = (context: string): string => noteDecoration(context, 'x', '注释')!.contextValue
 
 const orderOf = (item: MenuItem): number => Number(item.group?.split('@')[1] ?? 0)
@@ -60,6 +64,19 @@ describe('侧栏行尾按钮', () => {
     expect(itemsFor('view/item/context', 'inline', root)).toEqual([])
   })
 
+  it('「更改」组的文件行多一个「暂存」，排在最后；别的行都没有', () => {
+    expect(itemsFor('view/item/context', 'inline', unstaged)).toEqual([COPY_MENU, ADD_NOTE, STAGE])
+    expect(itemsFor('view/item/context', 'inline', noted(unstaged))).toEqual([COPY_MENU, EDIT_NOTE, STAGE])
+    for (const context of [file, folder, root, noted(file), noted(folder)])
+      expect(itemsFor('view/item/context', 'inline', context)).not.toContain(STAGE)
+  })
+
+  it('分组行（「暂存的更改」「更改」）什么按钮、菜单都没有', () => {
+    for (const group of ['inline', 'copy', 'notes'])
+      expect(itemsFor('view/item/context', group, GROUP_CONTEXT)).toEqual([])
+    expect(itemsFor(COPY_MENU, 'copy', GROUP_CONTEXT)).toEqual([])
+  })
+
   it('「复制」是带 copy 图标的子菜单（VS Code 画成点开的下拉按钮），注释按钮的图标是 note / edit', () => {
     expect(submenus.find(item => item.id === COPY_MENU)).toEqual({ id: COPY_MENU, label: '复制', icon: '$(copy)' })
     expect(commands.find(item => item.command === ADD_NOTE)?.icon).toBe('$(note)')
@@ -69,7 +86,7 @@ describe('侧栏行尾按钮', () => {
 
 describe('复制菜单', () => {
   it.each([COPY_MENU, 'view/item/context'])('%s：文件四项、文件夹没有「不带后缀」，有没有注释都一样', (menu) => {
-    for (const context of [file, noted(file)])
+    for (const context of [file, noted(file), unstaged, noted(unstaged)])
       expect(itemsFor(menu, 'copy', context)).toEqual(FILE_COPIES)
     for (const context of [folder, noted(folder)])
       expect(itemsFor(menu, 'copy', context)).toEqual(FOLDER_COPIES)
@@ -95,7 +112,7 @@ describe('复制菜单', () => {
 
 describe('右键菜单的注释', () => {
   it('没注释的目录 / 文件只有「添加注释」，有注释的只有「编辑注释」，工作区根没有', () => {
-    for (const context of [file, folder]) {
+    for (const context of [file, folder, unstaged]) {
       expect(itemsFor('view/item/context', 'notes', context)).toEqual([ADD_NOTE])
       expect(itemsFor('view/item/context', 'notes', noted(context))).toEqual([EDIT_NOTE])
     }
@@ -107,22 +124,44 @@ describe('筛选（审查工单、未提交的更改）', () => {
   const FILTER = 'superpowers.codeReader.filter'
   const PICK = 'superpowers.codeReader.pickReviewIssue'
   const UNCOMMITTED = 'superpowers.codeReader.showUncommitted'
+  const HIDE_TESTS = 'superpowers.codeReader.hideTests'
+  const SHOW_TESTS = 'superpowers.codeReader.showTests'
   const SHOW_ALL = 'superpowers.codeReader.showAllFiles'
+  const TESTS_HIDDEN = 'superpowers.codeReader.testsHidden'
+  const title = menus['view/title']
+    .filter(item => item.when.startsWith('view == superpowers.codeReader.files'))
+    .sort((a, b) => orderOf(a) - orderOf(b))
+  const whenOf = (command: string): string | undefined => title.find(item => item.command === command)?.when
 
-  it('标题栏：选工单、未提交的更改、开着筛选时才有的「显示全部」、刷新', () => {
-    const title = menus['view/title']
-      .filter(item => item.when.startsWith('view == superpowers.codeReader.files'))
-      .sort((a, b) => orderOf(a) - orderOf(b))
-    expect(title.map(item => item.command)).toEqual([PICK, UNCOMMITTED, SHOW_ALL, 'superpowers.codeReader.refresh'])
+  it('标题栏：选工单、未提交的更改、隐藏 / 显示测试文件、开着筛选时才有的「显示全部」、刷新', () => {
+    expect(title.map(item => item.command)).toEqual([PICK, UNCOMMITTED, HIDE_TESTS, SHOW_TESTS, SHOW_ALL, 'superpowers.codeReader.refresh'])
     expect(title.every(item => item.group?.startsWith('navigation'))).toBe(true)
-    expect(title.find(item => item.command === SHOW_ALL)?.when).toBe(`view == superpowers.codeReader.files && ${FILTER}`)
+    expect(whenOf(SHOW_ALL)).toBe(`view == superpowers.codeReader.files && ${FILTER}`)
     for (const command of [PICK, UNCOMMITTED])
-      expect(title.find(item => item.command === command)?.when).not.toContain(FILTER)
+      expect(whenOf(command)).not.toContain(FILTER)
   })
 
-  it('按钮的字和图标：选工单 git-pull-request，未提交的更改 git-commit，显示全部 close', () => {
+  it('隐藏 / 显示测试文件只在未提交的更改时有，按是否隐藏着换着显示', () => {
+    expect(whenOf(HIDE_TESTS)).toBe(`view == superpowers.codeReader.files && ${FILTER} == uncommitted && !${TESTS_HIDDEN}`)
+    expect(whenOf(SHOW_TESTS)).toBe(`view == superpowers.codeReader.files && ${FILTER} == uncommitted && ${TESTS_HIDDEN}`)
+    const palette = new Map(menus.commandPalette.map(item => [item.command, item.when]))
+    expect(palette.get(HIDE_TESTS)).toBe(`${FILTER} == uncommitted && !${TESTS_HIDDEN}`)
+    expect(palette.get(SHOW_TESTS)).toBe(`${FILTER} == uncommitted && ${TESTS_HIDDEN}`)
+  })
+
+  it('「暂存」只在未提交的更改时挂在「更改」组的文件行上，命令面板里藏起来', () => {
+    const stage = menus['view/item/context'].filter(item => item.command === STAGE)
+    expect(stage).toHaveLength(1)
+    expect(stage[0].when).toContain(`${FILTER} == uncommitted`)
+    expect(menus.commandPalette.find(item => item.command === STAGE)?.when).toBe('false')
+  })
+
+  it('按钮的字和图标', () => {
     expect(commands.find(item => item.command === PICK)).toMatchObject({ title: '选工单', icon: '$(git-pull-request)' })
     expect(commands.find(item => item.command === UNCOMMITTED)).toMatchObject({ title: '未提交的更改', icon: '$(git-commit)' })
+    expect(commands.find(item => item.command === HIDE_TESTS)).toMatchObject({ title: '隐藏测试文件', icon: '$(beaker-stop)' })
+    expect(commands.find(item => item.command === SHOW_TESTS)).toMatchObject({ title: '显示测试文件', icon: '$(beaker)' })
+    expect(commands.find(item => item.command === STAGE)).toMatchObject({ title: '暂存', icon: '$(add)' })
     expect(commands.find(item => item.command === SHOW_ALL)).toMatchObject({ title: '显示全部', icon: '$(close)' })
   })
 
diff --git a/vscode/src/codeReader/explorer/treeFilters.ts b/vscode/src/codeReader/explorer/treeFilters.ts
index 587793c..2dc7173 100644
--- a/vscode/src/codeReader/explorer/treeFilters.ts
+++ b/vscode/src/codeReader/explorer/treeFilters.ts
@@ -1,5 +1,5 @@
 import type { TreeView } from 'vscode'
-import type { FileNode, FileTreeProvider } from './fileTree'
+import type { FileTreeProvider, TreeNode } from './fileTree'
 import { commands, Disposable } from 'vscode'
 
 /** 上下文键：侧栏树开着哪种筛选，没设是全部文件。标题栏的「显示全部」、行上的注释按钮按它显示 / 藏起来。 */
@@ -24,7 +24,7 @@ export class TreeFilters {
   private readonly filters: TreeFilter[] = []
   private current: TreeFilter | undefined
 
-  constructor(private readonly files: FileTreeProvider, private readonly view: TreeView<FileNode>) {}
+  constructor(private readonly files: FileTreeProvider, private readonly view: TreeView<TreeNode>) {}
 
   /** 开着的那种筛选；没开是全部文件 */
   get active(): TreeFilter | undefined {
diff --git a/vscode/src/codeReader/index.ts b/vscode/src/codeReader/index.ts
index d0a4822..90d3fe0 100644
--- a/vscode/src/codeReader/index.ts
+++ b/vscode/src/codeReader/index.ts
@@ -1,5 +1,6 @@
 import type { ExtensionContext, Uri } from 'vscode'
 import type { CodeReaderApi, RuleLocation, RuleReference } from './contract'
+import type { FileNode } from './explorer/fileTree'
 import type { IndexedName } from './nameResolution'
 import { commands, window, workspace } from 'vscode'
 import { logger } from '../logging/logger'
@@ -110,6 +111,10 @@ export function registerCodeReader(context: ExtensionContext): CodeReaderApi {
     commands.registerCommand('superpowers.codeReader.refresh', () => filters.active ? filters.active.reload() : files.refresh()),
     commands.registerCommand('superpowers.codeReader.pickReviewIssue', () => review.pick()),
     commands.registerCommand('superpowers.codeReader.showUncommitted', () => uncommitted.enter()),
+    commands.registerCommand('superpowers.codeReader.hideTests', () => uncommitted.setTestsHidden(true)),
+    commands.registerCommand('superpowers.codeReader.showTests', () => uncommitted.setTestsHidden(false)),
+    // 「更改」组文件行上的按钮传来的是这一行的节点
+    commands.registerCommand('superpowers.codeReader.stage', (node?: FileNode) => uncommitted.stage(node)),
     commands.registerCommand('superpowers.codeReader.showAllFiles', () => filters.active?.exit()),
     commands.registerCommand(OPEN_COMMAND, (uri: Uri) => openFile(uri, registry)),
     // 标题栏按钮传来的是 (文件 Uri, { groupId })，原样转给 VS Code 定位是哪一组的哪个标签
diff --git a/vscode/src/codeReader/review/reviewMode.ts b/vscode/src/codeReader/review/reviewMode.ts
index 59461ee..3f1be97 100644
--- a/vscode/src/codeReader/review/reviewMode.ts
+++ b/vscode/src/codeReader/review/reviewMode.ts
@@ -2,7 +2,7 @@ import type { Disposable, ExtensionContext, QuickPickItem, TreeView, WorkspaceFo
 import type { PrFileDto } from '../../gitea/api'
 import type { RepoContext } from '../../gitea/repoContext'
 import type { Issue } from '../../gitea/types'
-import type { FileNode, FileTreeProvider } from '../explorer/fileTree'
+import type { FileTreeProvider, TreeNode } from '../explorer/fileTree'
 import type { TreeFilter, TreeFilters } from '../explorer/treeFilters'
 import type { FileCount } from './pickList'
 import * as path from 'node:path'
@@ -59,7 +59,7 @@ export class ReviewMode implements TreeFilter, Disposable {
   constructor(
     private readonly context: ExtensionContext,
     private readonly viewId: string,
-    private readonly view: TreeView<FileNode>,
+    private readonly view: TreeView<TreeNode>,
     private readonly files: FileTreeProvider,
     private readonly filters: TreeFilters,
   ) {
@@ -251,7 +251,7 @@ export class ReviewMode implements TreeFilter, Disposable {
     const changes = files.map(file => ({ path: file.path, change: changeOf(file.status) }))
     const entering = this.filters.enter(this, 'review')
     this.reviewing = issue.number
-    this.files.showChanges([{ folder, tree: buildChangedTree(changes) }])
+    this.files.showChanges([{ roots: [{ folder, tree: buildChangedTree(changes) }] }])
     this.decorations.show(changes.map(file => ({ uri: Uri.joinPath(root, file.path), change: file.change })))
     this.view.description = reviewDescription(issue.number)
     this.view.message = reviewMessage(issue, pr, files.length)
diff --git a/vscode/src/codeReader/uncommitted/testFiles.test.ts b/vscode/src/codeReader/uncommitted/testFiles.test.ts
new file mode 100644
index 0000000..080f215
--- /dev/null
+++ b/vscode/src/codeReader/uncommitted/testFiles.test.ts
@@ -0,0 +1,55 @@
+import { describe, expect, it } from 'vitest'
+import { isTestFile } from './testFiles'
+
+describe('测试文件', () => {
+  it('路径上有一层是测试目录的都算（不分大小写）', () => {
+    for (const path of [
+      'test/helpers.ts',
+      'backend/tests/user/factories.py',
+      'src/__tests__/App.tsx',
+      'src/__mocks__/axios.ts',
+      'src/components/__snapshots__/Button.test.tsx.snap',
+      'pkg/parser/testdata/input.json',
+      'Tests/AppTests/AppTests.swift',
+      'jetbrains/src/test/kotlin/PluginTest.kt',
+    ])
+      expect(isTestFile(path), path).toBe(true)
+  })
+
+  it('python：test_*.py、*_test.py、conftest.py', () => {
+    for (const path of ['backend/test_avatar.py', 'backend/avatar_test.py', 'backend/conftest.py', 'conftest.py'])
+      expect(isTestFile(path), path).toBe(true)
+  })
+
+  it('js / ts：*.test.*、*.spec.*', () => {
+    for (const path of ['src/a.test.ts', 'src/a.spec.tsx', 'src/a.test.js', 'src/a.spec.jsx', 'src/a.test.mjs', 'src/a.spec.cts', 'src/codeReader/review/changedFiles.test.ts'])
+      expect(isTestFile(path), path).toBe(true)
+  })
+
+  it('go：*_test.go', () => {
+    expect(isTestFile('pkg/server/handler_test.go')).toBe(true)
+  })
+
+  it('普通文件不算：名字里带 test 但不是约定的写法、目录名只是包含 test 的、别的扩展名的 spec', () => {
+    for (const path of [
+      'src/testing.ts',
+      'src/latest.py',
+      'src/contest.py',
+      'src/test.ts',
+      'src/attestation/verify.go',
+      'testing/utils.ts',
+      'src/tests.config.ts',
+      'docs/openapi.spec.yaml',
+      'docs/feature.spec.md',
+      'src/handler_test.ts',
+      'vitest.config.ts',
+      'src/testFiles.ts',
+    ])
+      expect(isTestFile(path), path).toBe(false)
+  })
+
+  it('测试目录只看目录，同名的文件不算', () => {
+    expect(isTestFile('scripts/test')).toBe(false)
+    expect(isTestFile('tests')).toBe(false)
+  })
+})
diff --git a/vscode/src/codeReader/uncommitted/testFiles.ts b/vscode/src/codeReader/uncommitted/testFiles.ts
new file mode 100644
index 0000000..05ebbcd
--- /dev/null
+++ b/vscode/src/codeReader/uncommitted/testFiles.ts
@@ -0,0 +1,27 @@
+/**
+ * 整个目录都算测试的目录名（不分大小写）：测试目录（含 Swift 的 `Tests`）、Jest 的 mock 和快照、Go 的测试数据。
+ */
+const TEST_DIRS = new Set(['test', 'tests', '__tests__', '__mocks__', '__snapshots__', 'testdata'])
+
+/**
+ * 按文件名认的测试文件：Python 的 `test_*.py`、`*_test.py`、`conftest.py`，
+ * JS / TS 的 `*.test.*`、`*.spec.*`（js、jsx、ts、tsx 和 m / c 开头的变体），Go 的 `*_test.go`。
+ */
+const TEST_FILE_NAMES: readonly RegExp[] = [
+  /^test_.+\.py$/,
+  /^.+_test\.py$/,
+  /^conftest\.py$/,
+  /^.+\.(?:test|spec)\.[cm]?[jt]sx?$/,
+  /^.+_test\.go$/,
+]
+
+/**
+ * 是不是测试文件：路径上有一层目录是测试目录，或者文件名照测试文件的约定起。
+ * 「未提交的更改」里隐藏测试文件时按它剔除。
+ * @param path 相对仓库根，`/` 分隔
+ */
+export function isTestFile(path: string): boolean {
+  const segments = path.split('/')
+  const name = segments.pop() ?? ''
+  return segments.some(dir => TEST_DIRS.has(dir.toLowerCase())) || TEST_FILE_NAMES.some(pattern => pattern.test(name))
+}
diff --git a/vscode/src/codeReader/uncommitted/uncommittedFiles.test.ts b/vscode/src/codeReader/uncommitted/uncommittedFiles.test.ts
index 060c4d3..c5fcb6c 100644
--- a/vscode/src/codeReader/uncommitted/uncommittedFiles.test.ts
+++ b/vscode/src/codeReader/uncommitted/uncommittedFiles.test.ts
@@ -2,7 +2,7 @@ import type { GitStatus } from '../../git/gitApi'
 import type { ChangeGroups } from './uncommittedFiles'
 import { describe, expect, it } from 'vitest'
 import { GIT_STATUS } from '../../git/gitApi'
-import { changeOfGitStatus, uncommittedFiles, uncommittedRoots, workspaceOrder } from './uncommittedFiles'
+import { changeOfGitStatus, uncommittedDescription, uncommittedFiles, uncommittedMessage, uncommittedRoots, withoutTestFiles, workspaceOrder } from './uncommittedFiles'
 
 const at = (path: string, status: GitStatus): { uri: { path: string }, status: GitStatus } => ({ uri: { path }, status })
 
@@ -37,57 +37,56 @@ describe('git 状态 → 改动', () => {
   })
 })
 
-describe('一个仓库里没提交的文件', () => {
-  it('合并冲突、暂存、没暂存、未跟踪的合在一起，路径相对仓库根', () => {
+describe('一个仓库里没提交的文件，分两区', () => {
+  it('暂存的更改是暂存区的；更改是合并冲突、没暂存、未跟踪的；路径相对仓库根', () => {
     expect(uncommittedFiles('/repo', groups({
       mergeChanges: [at('/repo/conflict.ts', GIT_STATUS.BOTH_MODIFIED)],
-      indexChanges: [at('/repo/src/staged.ts', GIT_STATUS.INDEX_MODIFIED)],
+      indexChanges: [at('/repo/src/staged.ts', GIT_STATUS.INDEX_MODIFIED), at('/repo/src/added.ts', GIT_STATUS.INDEX_ADDED)],
       workingTreeChanges: [at('/repo/src/gone.ts', GIT_STATUS.DELETED)],
       untrackedChanges: [at('/repo/docs/new.md', GIT_STATUS.UNTRACKED)],
-    }))).toEqual([
-      { path: 'conflict.ts', change: 'M' },
-      { path: 'src/staged.ts', change: 'M' },
-      { path: 'src/gone.ts', change: 'D' },
-      { path: 'docs/new.md', change: 'A' },
-    ])
+    }))).toEqual({
+      staged: [
+        { path: 'src/staged.ts', change: 'M' },
+        { path: 'src/added.ts', change: 'A' },
+      ],
+      changes: [
+        { path: 'conflict.ts', change: 'M' },
+        { path: 'src/gone.ts', change: 'D' },
+        { path: 'docs/new.md', change: 'A' },
+      ],
+    })
   })
 
-  it('暂存了又改了的只留一项', () => {
-    expect(uncommittedFiles('/repo', groups({
-      indexChanges: [at('/repo/a.ts', GIT_STATUS.INDEX_MODIFIED)],
-      workingTreeChanges: [at('/repo/a.ts', GIT_STATUS.MODIFIED)],
-    }))).toEqual([{ path: 'a.ts', change: 'M' }])
-  })
-
-  it('新加的暂存后又改了，还是 A', () => {
+  it('暂存后又改了的两区都有，各带各的改动（和源代码管理视图一样）', () => {
     expect(uncommittedFiles('/repo', groups({
       indexChanges: [at('/repo/a.ts', GIT_STATUS.INDEX_ADDED)],
       workingTreeChanges: [at('/repo/a.ts', GIT_STATUS.MODIFIED)],
-    }))).toEqual([{ path: 'a.ts', change: 'A' }])
+    }))).toEqual({ staged: [{ path: 'a.ts', change: 'A' }], changes: [{ path: 'a.ts', change: 'M' }] })
   })
 
-  it('新加的暂存后又在盘上删了，是 D（打不开）', () => {
-    expect(uncommittedFiles('/repo', groups({
-      indexChanges: [at('/repo/a.ts', GIT_STATUS.INDEX_ADDED)],
-      workingTreeChanges: [at('/repo/a.ts', GIT_STATUS.DELETED)],
-    }))).toEqual([{ path: 'a.ts', change: 'D' }])
-  })
-
-  it('从暂存区删掉、文件还在盘上（git rm --cached）的，照盘上算 A', () => {
+  it('从暂存区删掉、文件还在盘上（git rm --cached）的：暂存区里是 D，更改里是 A', () => {
     expect(uncommittedFiles('/repo', groups({
       indexChanges: [at('/repo/a.ts', GIT_STATUS.INDEX_DELETED)],
       untrackedChanges: [at('/repo/a.ts', GIT_STATUS.UNTRACKED)],
-    }))).toEqual([{ path: 'a.ts', change: 'A' }])
+    }))).toEqual({ staged: [{ path: 'a.ts', change: 'D' }], changes: [{ path: 'a.ts', change: 'A' }] })
+  })
+
+  it('同一区里同一个文件只留一项，后面的组盖掉前面的', () => {
+    expect(uncommittedFiles('/repo', groups({
+      mergeChanges: [at('/repo/a.ts', GIT_STATUS.BOTH_MODIFIED)],
+      workingTreeChanges: [at('/repo/a.ts', GIT_STATUS.DELETED)],
+    })).changes).toEqual([{ path: 'a.ts', change: 'D' }])
   })
 
   it('仓库根本身、仓库外面的路径不要', () => {
     expect(uncommittedFiles('/repo', groups({
+      indexChanges: [at('/other/c.ts', GIT_STATUS.INDEX_MODIFIED)],
       workingTreeChanges: [at('/repo', GIT_STATUS.MODIFIED), at('/other/a.ts', GIT_STATUS.MODIFIED), at('/repository/b.ts', GIT_STATUS.MODIFIED)],
-    }))).toEqual([])
+    }))).toEqual({ staged: [], changes: [] })
   })
 
-  it('没有改动时是空的', () => {
-    expect(uncommittedFiles('/repo', groups({}))).toEqual([])
+  it('没有改动时两区都是空的', () => {
+    expect(uncommittedFiles('/repo', groups({}))).toEqual({ staged: [], changes: [] })
   })
 })
 
@@ -101,7 +100,13 @@ describe('工作区里有改动的仓库', () => {
     const [root] = uncommittedRoots([changed('/work/app')], [app])
     expect(root.folder).toBe(app)
     expect(root.name).toBe('应用')
-    expect(root.files).toEqual([{ path: 'a.ts', change: 'M' }])
+    expect(root.staged).toEqual([])
+    expect(root.changes).toEqual([{ path: 'a.ts', change: 'M' }])
+  })
+
+  it('只有暂存的更改的仓库也摆', () => {
+    const roots = uncommittedRoots([repo('/work/app', { indexChanges: [at('/work/app/a.ts', GIT_STATUS.INDEX_MODIFIED)] })], [folder('/work/app', 'app')])
+    expect(roots.map(root => [root.staged.length, root.changes.length])).toEqual([[1, 0]])
   })
 
   it('嵌套在工作区文件夹里的、包着工作区文件夹的仓库也算，名字用仓库根目录的名字', () => {
@@ -141,3 +146,45 @@ describe('算不算工作区里的仓库', () => {
     expect(workspaceOrder('/worktrees/review-1', folders)).toBe(-1)
   })
 })
+
+describe('隐藏测试文件', () => {
+  const file = (path: string, change: 'M' | 'A' | 'D' = 'M'): { path: string, change: 'M' | 'A' | 'D' } => ({ path, change })
+
+  it('两区都剔除测试文件，数出藏了几个（两区都有的算一个）', () => {
+    const { roots, hidden } = withoutTestFiles([{
+      name: 'app',
+      staged: [file('src/a.ts'), file('src/a.test.ts', 'A')],
+      changes: [file('src/a.test.ts'), file('tests/test_api.py'), file('src/b.ts')],
+    }])
+    expect(hidden).toBe(2)
+    expect(roots).toEqual([{ name: 'app', staged: [file('src/a.ts')], changes: [file('src/b.ts')] }])
+  })
+
+  it('几个仓库的加在一起；剔完两区都空的仓库不摆', () => {
+    const { roots, hidden } = withoutTestFiles([
+      { name: 'app', staged: [], changes: [file('handler_test.go')] },
+      { name: 'lib', staged: [file('conftest.py')], changes: [file('lib.py')] },
+    ])
+    expect(hidden).toBe(2)
+    expect(roots.map(root => root.name)).toEqual(['lib'])
+  })
+
+  it('没有测试文件时原样、藏了 0 个', () => {
+    const only = { name: 'app', staged: [file('a.ts')], changes: [] }
+    expect(withoutTestFiles([only])).toEqual({ roots: [only], hidden: 0 })
+  })
+})
+
+describe('标题后面的字、标题下面的一行', () => {
+  it('藏了测试文件时标题后面注明藏了几个', () => {
+    expect(uncommittedDescription(0)).toBe('未提交的更改')
+    expect(uncommittedDescription(3)).toBe('未提交的更改 · 已隐藏 3 个测试文件')
+  })
+
+  it('树上有文件时没有提示；只剩藏起来的测试文件、什么都没有、git 还在找仓库时各说一句', () => {
+    expect(uncommittedMessage({ hasFiles: true, hiddenTests: 2, loading: false })).toBeUndefined()
+    expect(uncommittedMessage({ hasFiles: false, hiddenTests: 2, loading: false })).toBe('除了隐藏的测试文件，没有未提交的更改')
+    expect(uncommittedMessage({ hasFiles: false, hiddenTests: 0, loading: false })).toBe('没有未提交的更改')
+    expect(uncommittedMessage({ hasFiles: false, hiddenTests: 0, loading: true })).toBe('正在读取 git 状态…')
+  })
+})
diff --git a/vscode/src/codeReader/uncommitted/uncommittedFiles.ts b/vscode/src/codeReader/uncommitted/uncommittedFiles.ts
index 7093c87..fe841fc 100644
--- a/vscode/src/codeReader/uncommitted/uncommittedFiles.ts
+++ b/vscode/src/codeReader/uncommitted/uncommittedFiles.ts
@@ -3,6 +3,7 @@ import type { ChangedFile, FileChange } from '../explorer/changedTree'
 import { posix } from 'node:path'
 import { GIT_STATUS } from '../../git/gitApi'
 import { toPathKey } from '../pathMap'
+import { isTestFile } from './testFiles'
 
 /** 一组改动里的一项：文件在哪（Uri.path）、git 状态。 */
 interface StatusEntry {
@@ -42,26 +43,38 @@ export function changeOfGitStatus(status: GitStatus): FileChange {
   return ADDED.has(status) ? 'A' : DELETED.has(status) ? 'D' : 'M'
 }
 
-/**
- * 一个仓库里没提交的文件：合并冲突的、暂存的、没暂存的、未跟踪的合在一起，路径相对仓库根、`/` 分隔。
- * 同一个文件在几组里都有（暂存了又改了）只留一项：照上面的次序越往后越接近盘上现在的样子，后面的盖掉前面的；
- * 只是「改了」不盖掉前面的新增（新加的文件暂存后又改了，还是新加的）。
- */
-export function uncommittedFiles(rootPath: string, groups: ChangeGroups): ChangedFile[] {
+/** 源代码管理视图两个区里的文件，路径相对仓库根、`/` 分隔。 */
+export interface UncommittedFiles {
+  /** 暂存的更改：暂存区里的 */
+  staged: ChangedFile[]
+  /** 更改：合并冲突的、没暂存的、未跟踪的 */
+  changes: ChangedFile[]
+}
+
+/** 几组改动合成一个区：同一个文件只留一项（后面的组盖掉前面的）；仓库根本身、仓库外面的路径不要。 */
+function collect(rootPath: string, groups: readonly (readonly StatusEntry[])[]): ChangedFile[] {
   const files = new Map<string, FileChange>()
-  for (const group of [groups.mergeChanges, groups.indexChanges, groups.workingTreeChanges, groups.untrackedChanges]) {
+  for (const group of groups) {
     for (const { uri, status } of group) {
       const key = toPathKey(rootPath, uri.path)
-      if (key === undefined)
-        continue
-      const change = changeOfGitStatus(status)
-      const before = files.get(key)
-      files.set(key, change === 'M' && before !== undefined ? before : change)
+      if (key !== undefined)
+        files.set(key, changeOfGitStatus(status))
     }
   }
   return [...files].map(([path, change]) => ({ path, change }))
 }
 
+/**
+ * 一个仓库里没提交的文件，照源代码管理视图分两区：暂存的更改（暂存区）、更改（合并冲突、没暂存、未跟踪）。
+ * 暂存后又改了的文件两区都有。
+ */
+export function uncommittedFiles(rootPath: string, groups: ChangeGroups): UncommittedFiles {
+  return {
+    staged: collect(rootPath, [groups.indexChanges]),
+    changes: collect(rootPath, [groups.mergeChanges, groups.workingTreeChanges, groups.untrackedChanges]),
+  }
+}
+
 function sameOrUnder(child: string, parent: string): boolean {
   return child === parent || toPathKey(parent, child) !== undefined
 }
@@ -78,14 +91,13 @@ interface RepositoryLike {
   readonly state: ChangeGroups
 }
 
-/** 有没提交的文件的一个仓库，侧栏上一个根节点。 */
-export interface UncommittedRoot<R, F> {
+/** 有没提交的文件的一个仓库，两个区里各是侧栏上一个根节点。 */
+export interface UncommittedRoot<R, F> extends UncommittedFiles {
   repository: R
   /** 仓库根就是这个工作区文件夹时是它 */
   folder: F | undefined
   /** 根节点上的名字：仓库根就是工作区文件夹时用文件夹的名字，别的用仓库根目录的名字 */
   name: string
-  files: ChangedFile[]
 }
 
 /**
@@ -108,7 +120,45 @@ export function uncommittedRoots<R extends RepositoryLike, F extends FolderLike>
     .sort((a, b) => a.order - b.order || (a.rootPath < b.rootPath ? -1 : a.rootPath > b.rootPath ? 1 : 0))
     .map(({ repository, rootPath }) => {
       const folder = folders.find(item => item.uri.path === rootPath)
-      return { repository, folder, name: folder?.name ?? posix.basename(rootPath), files: uncommittedFiles(rootPath, repository.state) }
+      return { repository, folder, name: folder?.name ?? posix.basename(rootPath), ...uncommittedFiles(rootPath, repository.state) }
     })
-    .filter(root => root.files.length > 0)
+    .filter(hasFiles)
+}
+
+function hasFiles(files: UncommittedFiles): boolean {
+  return files.staged.length > 0 || files.changes.length > 0
+}
+
+/**
+ * 剔除测试文件（见 isTestFile）：两个区都剔，剔完两区都空的仓库不摆。
+ * @returns 剩下的仓库，和藏了几个测试文件（暂存后又改了、两区都有的算一个）
+ */
+export function withoutTestFiles<T extends UncommittedFiles>(roots: readonly T[]): { roots: T[], hidden: number } {
+  let hidden = 0
+  const kept = roots.map((root) => {
+    const tests = new Set([...root.staged, ...root.changes].map(file => file.path).filter(isTestFile))
+    hidden += tests.size
+    const keep = (file: ChangedFile): boolean => !tests.has(file.path)
+    return { ...root, staged: root.staged.filter(keep), changes: root.changes.filter(keep) }
+  })
+  return { roots: kept.filter(hasFiles), hidden }
+}
+
+/** 「更改」区里文件行的 contextValue 带的标记（见 entryContext）：这些行上挂「暂存」按钮。 */
+export const UNSTAGED_MARKER = 'unstaged'
+
+/** 开着时视图标题后面淡色的字（TreeView.description）：藏了测试文件时注明藏了几个。 */
+export function uncommittedDescription(hiddenTests: number): string {
+  return hiddenTests > 0 ? `未提交的更改 · 已隐藏 ${hiddenTests} 个测试文件` : '未提交的更改'
+}
+
+/**
+ * 标题下面的一行（TreeView.message）：树上有文件时没有；只剩藏起来的测试文件、什么都没有、git 还在找仓库时各说一句。
+ */
+export function uncommittedMessage(state: { hasFiles: boolean, hiddenTests: number, loading: boolean }): string | undefined {
+  if (state.hasFiles)
+    return undefined
+  if (state.hiddenTests > 0)
+    return '除了隐藏的测试文件，没有未提交的更改'
+  return state.loading ? '正在读取 git 状态…' : '没有未提交的更改'
 }
diff --git a/vscode/src/codeReader/uncommitted/uncommittedMode.ts b/vscode/src/codeReader/uncommitted/uncommittedMode.ts
index 3b1c3e6..0752074 100644
--- a/vscode/src/codeReader/uncommitted/uncommittedMode.ts
+++ b/vscode/src/codeReader/uncommitted/uncommittedMode.ts
@@ -1,17 +1,25 @@
-import type { ExtensionContext, TreeView } from 'vscode'
+import type { ExtensionContext, TreeView, WorkspaceFolder } from 'vscode'
 import type { GitApi, GitRepository } from '../../git/gitApi'
-import type { FileNode, FileTreeProvider } from '../explorer/fileTree'
+import type { ChangedFile } from '../explorer/changedTree'
+import type { ChangedSection, FileNode, FileTreeProvider, TreeNode } from '../explorer/fileTree'
 import type { TreeFilter, TreeFilters } from '../explorer/treeFilters'
-import { Disposable, window, workspace } from 'vscode'
+import type { UncommittedRoot } from './uncommittedFiles'
+import * as path from 'node:path'
+import { commands, Disposable, window, workspace } from 'vscode'
 import { loadGitApi } from '../../git/gitExtension'
 import { logger } from '../../logging/logger'
 import { buildChangedTree } from '../explorer/changedTree'
-import { uncommittedRoots, workspaceOrder } from './uncommittedFiles'
+import { uncommittedDescription, uncommittedMessage, uncommittedRoots, UNSTAGED_MARKER, withoutTestFiles, workspaceOrder } from './uncommittedFiles'
 
 /** workspaceState：开着「未提交的更改」，重开窗口接着显示。 */
 const UNCOMMITTED_KEY = 'superpowers.codeReader.uncommitted'
-/** 开着时视图标题后面淡色的字（TreeView.description）。 */
-const UNCOMMITTED_DESCRIPTION = '未提交的更改'
+/** workspaceState：隐藏测试文件。 */
+const HIDE_TESTS_KEY = 'superpowers.codeReader.hideTests'
+/** 上下文键：隐藏着测试文件。标题栏的「隐藏测试文件 / 显示测试文件」按它换着显示。 */
+const TESTS_HIDDEN_CONTEXT = 'superpowers.codeReader.testsHidden'
+/** 两个分组的名字，照 VS Code 源代码管理视图的中文界面。 */
+const STAGED_LABEL = '暂存的更改'
+const CHANGES_LABEL = '更改'
 /** git 状态连着变（保存、暂存、切分支）时合成一次重摆。 */
 const REBUILD_DELAY_MS = 300
 
@@ -23,9 +31,10 @@ function errorText(err: unknown): string {
 }
 
 /**
- * 侧栏只看未提交的更改：树里只剩工作区各 git 仓库里没提交的文件（暂存的、没暂存的、未跟踪的、合并冲突的），每个有改动的仓库一个根。
- * 文件就是工作区里的文件，颜色和 M / A / D 徽标由 VS Code 自带的 git 装饰加上。开着时盯着 git 状态自动重摆；「显示全部」回到工作区文件树。
- * 开着没开按工作区记住；和审查工单互斥，见 TreeFilters。
+ * 侧栏只看未提交的更改：照源代码管理视图分「暂存的更改」「更改」两组（空的不摆），每组下面每个有改动的仓库一个根。
+ * 文件就是工作区里的文件，颜色和 M / A / D 徽标由 VS Code 自带的 git 装饰加上；「更改」组里的文件行上有「暂存」按钮。
+ * 可以隐藏测试文件。开着时盯着 git 状态自动重摆；「显示全部」回到工作区文件树。
+ * 开着没开、隐不隐藏测试文件都按工作区记住；和审查工单互斥，见 TreeFilters。
  */
 export class UncommittedMode implements TreeFilter, Disposable {
   private readonly disposables: Disposable[]
@@ -38,15 +47,18 @@ export class UncommittedMode implements TreeFilter, Disposable {
   private shown: string | undefined
   /** 每进一次、退一次都加一：等 git 扩展回来时已经退出或又进了一次的，结果丢掉。 */
   private generation = 0
+  private hideTests: boolean
 
   /** viewId 是侧栏视图的 id：刷新时在这个视图上转进度。 */
   constructor(
     private readonly context: ExtensionContext,
     private readonly viewId: string,
-    private readonly view: TreeView<FileNode>,
+    private readonly view: TreeView<TreeNode>,
     private readonly files: FileTreeProvider,
     private readonly filters: TreeFilters,
   ) {
+    this.hideTests = context.workspaceState.get<boolean>(HIDE_TESTS_KEY) ?? false
+    void commands.executeCommand('setContext', TESTS_HIDDEN_CONTEXT, this.hideTests)
     filters.add(this)
     this.disposables = [filters.whenShown(() => void this.restore())]
   }
@@ -80,6 +92,37 @@ export class UncommittedMode implements TreeFilter, Disposable {
     this.rebuild()
   }
 
+  /** 「隐藏测试文件 / 显示测试文件」：两组都剔除 / 放回测试文件，按工作区记住。 */
+  async setTestsHidden(hidden: boolean): Promise<void> {
+    this.hideTests = hidden
+    this.rebuild()
+    await Promise.all([
+      commands.executeCommand('setContext', TESTS_HIDDEN_CONTEXT, hidden),
+      this.context.workspaceState.update(HIDE_TESTS_KEY, hidden || undefined),
+    ])
+  }
+
+  /** 「更改」组里文件行上的「暂存」：把这个文件放进暂存区（新文件、删掉的、冲突的都行），树跟着 git 状态变。 */
+  async stage(node: FileNode | undefined): Promise<void> {
+    const api = this.api
+    if (!node || !api)
+      return // 只挂在开着时「更改」组的文件行上
+    const name = path.basename(node.uri.fsPath)
+    const repository = api.getRepository(node.uri)
+    if (!repository) {
+      logger.add({ level: 'warn', source: 'codeReader', message: `未提交的更改：${name} 不在打开的 git 仓库里，没法暂存`, details: node.uri.fsPath })
+      void window.showErrorMessage(`没法暂存 ${name}：找不到它所在的 git 仓库`)
+      return
+    }
+    try {
+      await repository.add([node.uri.fsPath])
+    }
+    catch (err) {
+      logger.add({ level: 'error', source: 'codeReader', message: `未提交的更改：暂存 ${name} 失败`, details: `${node.uri.fsPath}\n${errorText(err)}` })
+      void window.showErrorMessage(`没能暂存 ${name}：${errorText(err)}`)
+    }
+  }
+
   dispose(): void {
     this.stopWatching()
     for (const disposable of this.disposables)
@@ -111,7 +154,6 @@ export class UncommittedMode implements TreeFilter, Disposable {
     this.api = api
     this.watching = this.watch(api)
     const entering = this.filters.enter(this, 'uncommitted')
-    this.view.description = UNCOMMITTED_DESCRIPTION
     this.rebuild()
     await Promise.all([entering, this.context.workspaceState.update(UNCOMMITTED_KEY, true)])
   }
@@ -168,24 +210,42 @@ export class UncommittedMode implements TreeFilter, Disposable {
     this.shown = undefined
   }
 
-  /** 按 git 现在的状态重摆树；和树上摆着的一样就不动。没有改动时标题下面写一行说明。 */
+  /** 按 git 现在的状态（和隐不隐藏测试文件）重摆树、标题后面的字、标题下面的一行；树上摆的没变就不重画。 */
   private rebuild(): void {
     const api = this.api
     if (!api)
       return
     const folders = workspace.workspaceFolders ?? []
-    const roots = uncommittedRoots(api.repositories, folders)
-    this.view.message = roots.length > 0
-      ? undefined
-      : api.state === 'initialized' ? '没有未提交的更改' : '正在读取 git 状态…'
-    const shown = JSON.stringify(roots.map(root => [root.repository.rootUri.toString(), root.name, root.files]))
+    const all = uncommittedRoots(api.repositories, folders)
+    const { roots, hidden } = this.hideTests ? withoutTestFiles(all) : { roots: all, hidden: 0 }
+    this.view.description = uncommittedDescription(hidden)
+    this.view.message = uncommittedMessage({ hasFiles: roots.length > 0, hiddenTests: hidden, loading: api.state !== 'initialized' })
+    const shown = JSON.stringify(roots.map(root => [root.repository.rootUri.toString(), root.name, root.staged, root.changes]))
     if (shown === this.shown)
       return
     this.shown = shown
-    this.files.showChanges(roots.map(root => ({
-      // 仓库根不是工作区文件夹时（嵌套的仓库、包着工作区文件夹的仓库）拿仓库根当根，名字用仓库根目录的名字
-      folder: root.folder ?? { uri: root.repository.rootUri, name: root.name, index: folders.length },
-      tree: buildChangedTree(root.files),
-    })))
+    // 仓库根不是工作区文件夹时（嵌套的仓库、包着工作区文件夹的仓库）拿仓库根当根，名字用仓库根目录的名字
+    const placed = roots.map(root => ({ root, folder: root.folder ?? { uri: root.repository.rootUri, name: root.name, index: folders.length } }))
+    this.files.showChanges([
+      section(STAGED_LABEL, placed, root => root.staged),
+      section(CHANGES_LABEL, placed, root => root.changes, UNSTAGED_MARKER),
+    ].filter(group => group.roots.length > 0))
+  }
+}
+
+/** 一个分组：有这个区的文件的仓库各一个根，分组行后面写这个区一共几个文件。 */
+function section(
+  label: string,
+  placed: readonly { root: UncommittedRoot<GitRepository, WorkspaceFolder>, folder: WorkspaceFolder }[],
+  filesOf: (root: UncommittedRoot<GitRepository, WorkspaceFolder>) => ChangedFile[],
+  fileMarker?: string,
+): ChangedSection {
+  const withFiles = placed.filter(({ root }) => filesOf(root).length > 0)
+  const count = withFiles.reduce((sum, { root }) => sum + filesOf(root).length, 0)
+  return {
+    label,
+    description: String(count),
+    ...(fileMarker ? { fileMarker } : {}),
+    roots: withFiles.map(({ root, folder }) => ({ folder, tree: buildChangedTree(filesOf(root)) })),
   }
 }
diff --git a/vscode/src/git/gitApi.ts b/vscode/src/git/gitApi.ts
index 2707558..eb0534d 100644
--- a/vscode/src/git/gitApi.ts
+++ b/vscode/src/git/gitApi.ts
@@ -53,6 +53,8 @@ export interface GitRepository {
   readonly state: GitRepositoryState
   /** 重读这个仓库的 git 状态 */
   status: () => Promise<void>
+  /** 把这些文件（绝对路径）放进暂存区，同 git add：新文件、删掉的、冲突的都行 */
+  add: (paths: string[]) => Promise<void>
 }
 
 /** initialized 之前 git 扩展还在找工作区里的仓库，repositories 可能不全。 */
@@ -64,6 +66,8 @@ export interface GitApi {
   readonly repositories: readonly GitRepository[]
   readonly onDidOpenRepository: Event<GitRepository>
   readonly onDidCloseRepository: Event<GitRepository>
+  /** 文件所在的仓库（按路径找，删掉的文件也行）；不在任何打开的仓库里时 null */
+  getRepository: (uri: Uri) => GitRepository | null
 }
 
 /** vscode.git 扩展激活后导出的东西。 */