diff --git a/vscode/src/codeReader/callTree/walk.test.ts b/vscode/src/codeReader/callTree/walk.test.ts
index e784ae5..cca01b3 100644
--- a/vscode/src/codeReader/callTree/walk.test.ts
+++ b/vscode/src/codeReader/callTree/walk.test.ts
@@ -10,6 +10,10 @@ function range(line: number, character = 0): CallRange {
   return { line, character, endLine: line, endCharacter: character + 3 }
 }
 
+function symbolIn(path: string, name: string): CallSymbol {
+  return { ...symbol(name), path }
+}
+
 describe('顺着调用者往上收集调用边', () => {
   it('有环就停，不再问已经走过的那个', async () => {
     const target = symbol('mask_phone')
@@ -85,6 +89,73 @@ describe('顺着调用者往上收集调用边', () => {
     ])
   })
 
+  it('业务代码的调用者里有测试函数：测试函数不当调用者，也不再往上问', async () => {
+    const target = symbolIn('app/sync.py', 'sync_users')
+    const job = symbolIn('app/jobs.py', 'run_jobs')
+    const inTestsDir = symbolIn('tests/test_sync.py', 'test_sync_runs')
+    const byFileName = symbolIn('test_x.py', 'test_x')
+    const asked: string[] = []
+    const outgoingAsked: string[] = []
+    const edges = await collectCallEdges(target, async (node) => {
+      asked.push(node.name)
+      if (node.name === 'sync_users') {
+        return [
+          { from: inTestsDir, ranges: [range(3)] },
+          { from: byFileName, ranges: [range(5)] },
+          { from: job, ranges: [range(7)] },
+        ]
+      }
+      return []
+    }, async (node) => {
+      outgoingAsked.push(node.name)
+      return []
+    })
+    expect(asked).toEqual(['sync_users', 'run_jobs'])
+    expect(outgoingAsked).toEqual(['run_jobs'])
+    expect(edges).toEqual([{ caller: job, callee: target, at: range(7) }])
+  })
+
+  it('往下问到的被调用方在测试文件里，这条边不收', async () => {
+    const target = symbolIn('app/sync.py', 'sync_users')
+    const job = symbolIn('app/jobs.py', 'run_jobs')
+    const fixture = symbolIn('tests/conftest.py', 'make_user')
+    const side = symbolIn('app/log.py', 'log_event')
+    const edges = await collectCallEdges(target, async (node) => {
+      if (node.name === 'sync_users')
+        return [{ from: job, ranges: [range(4)] }]
+      return []
+    }, async () => [
+      { to: target, ranges: [range(4)] },
+      { to: fixture, ranges: [range(6)] },
+      { to: side, ranges: [range(8)] },
+    ])
+    expect(edges).toEqual([
+      { caller: job, callee: target, at: range(4) },
+      { caller: job, callee: side, at: range(8) },
+    ])
+  })
+
+  it('当前块本身在测试文件里：测试函数照样当调用者，往下问到的测试代码也收', async () => {
+    const target = symbolIn('tests/conftest.py', 'make_user')
+    const caller = symbolIn('tests/test_sync.py', 'test_sync_runs')
+    const helper = symbolIn('tests/helpers.py', 'fake_db')
+    const asked: string[] = []
+    const edges = await collectCallEdges(target, async (node) => {
+      asked.push(node.name)
+      if (node.name === 'make_user')
+        return [{ from: caller, ranges: [range(2)] }]
+      return []
+    }, async () => [
+      { to: target, ranges: [range(2)] },
+      { to: helper, ranges: [range(5)] },
+    ])
+    expect(asked).toEqual(['make_user', 'test_sync_runs'])
+    expect(edges).toEqual([
+      { caller, callee: target, at: range(2) },
+      { caller, callee: helper, at: range(5) },
+    ])
+  })
+
   it('取消之后不再问下一个人', async () => {
     const target = symbol('mask_phone')
     const caller = symbol('get_profile')
diff --git a/vscode/src/codeReader/callTree/walk.ts b/vscode/src/codeReader/callTree/walk.ts
index 9a015fe..d09bd0c 100644
--- a/vscode/src/codeReader/callTree/walk.ts
+++ b/vscode/src/codeReader/callTree/walk.ts
@@ -4,6 +4,7 @@
  */
 
 import type { CallEdge, CallRange, CallSymbol } from './model'
+import { isTestFile } from '../uncommitted/testFiles'
 import { CALL_TREE_MAX_DEPTH, symbolKey } from './model'
 
 /** 一个调用者，以及它里面每一处调用的范围。 */
@@ -22,6 +23,8 @@ export interface OutgoingHit {
  * 收集通向 start 的调用边，再加上这些调用者通向别处的边。
  * 有环就停。往上最多 8 层。cancelled 变成真就停，已经收到的也不要了。
  * start 自己不再往下问：它调用了谁不画在这棵树上。
+ * start 不在测试文件里时，测试文件（见 isTestFile）里的符号不算：不当调用者，不再往上问，往下问到的被调用方在测试文件里也不收。
+ * start 本身在测试文件里，说明正在读测试代码，就照常全收。
  */
 export async function collectCallEdges(
   start: CallSymbol,
@@ -36,6 +39,8 @@ export async function collectCallEdges(
   const ancestors = new Map<string, CallSymbol>()
   const walked = new Map<string, number>()
   const startKey = symbolKey(start)
+  const readingTests = isTestFile(start.path)
+  const counted = (symbol: CallSymbol) => readingTests || !isTestFile(symbol.path)
 
   const add = (caller: CallSymbol, callee: CallSymbol, at: CallRange) => {
     const edge: CallEdge = { caller, callee, at }
@@ -57,7 +62,7 @@ export async function collectCallEdges(
     const next = new Map<string, CallSymbol>()
     for (const call of calls) {
       const key = symbolKey(call.from)
-      if (here.has(key))
+      if (here.has(key) || !counted(call.from))
         continue
       for (const at of uniqueRanges(call.ranges))
         add(call.from, node, at)
@@ -87,6 +92,8 @@ export async function collectCallEdges(
     if (cancelled())
       return []
     for (const call of calls) {
+      if (!counted(call.to))
+        continue
       for (const at of uniqueRanges(call.ranges))
         add(ancestor, call.to, at)
     }
diff --git a/vscode/src/codeReader/uncommitted/testFiles.ts b/vscode/src/codeReader/uncommitted/testFiles.ts
index 4d8af83..69e7d81 100644
--- a/vscode/src/codeReader/uncommitted/testFiles.ts
+++ b/vscode/src/codeReader/uncommitted/testFiles.ts
@@ -17,7 +17,7 @@ const TEST_FILE_NAMES: readonly RegExp[] = [
 
 /**
  * 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」和审查隐藏测试文件时按它剔除。
+ * 「未提交的更改」和审查隐藏测试文件、调用树不算测试代码，都按它认。
  * @param path 相对仓库根，`/` 分隔
  */
 export function isTestFile(path: string): boolean {