diff --git a/test/helpers/stub-gitea.js b/test/helpers/stub-gitea.js
index 8b76f23..df1dd1e 100644
--- a/test/helpers/stub-gitea.js
+++ b/test/helpers/stub-gitea.js
@@ -89,3 +89,17 @@ function safeParse(raw) {
     return raw;
   }
 }
+
+/**
+ * 啟動假 Gitea 並登記在測試結束時關掉，省去每支測試各寫一次 close。
+ * @param {object} t node:test 的 TestContext
+ * @param {Record<string, object|Function>} routes
+ */
+export async function withStubGitea(t, routes) {
+  const stub = await startStubGitea(routes);
+  t.after(() => stub.close());
+  return stub;
+}
+
+/** 把腳本指向這台假 Gitea 的環境變數 */
+export const stubEnv = (stub) => ({ TEA_SDLC_API_BASE: stub.base, TEA_SDLC_TOKEN: 'stub-token' });
diff --git a/test/labels-list.test.js b/test/labels-list.test.js
index 5e54b67..c156828 100644
--- a/test/labels-list.test.js
+++ b/test/labels-list.test.js
@@ -1,20 +1,15 @@
 import test from 'node:test';
 import assert from 'node:assert/strict';
 import { runScript } from './helpers/run-script.js';
-import { startStubGitea, healthyRoutes } from './helpers/stub-gitea.js';
+import { healthyRoutes, stubEnv as envFor, withStubGitea } from './helpers/stub-gitea.js';
 
 const REPO = 'plugins/tea-sdlc';
 
 /** 讓每個測試都拿到一台乾淨的假 Gitea，並在結束後關掉 */
 async function withStub(t, overrides = {}) {
-  const stub = await startStubGitea(healthyRoutes(REPO, overrides));
-  t.after(() => stub.close());
-  return stub;
+  return withStubGitea(t, healthyRoutes(REPO, overrides));
 }
 
-function envFor(stub) {
-  return { TEA_SDLC_API_BASE: stub.base, TEA_SDLC_TOKEN: 'stub-token' };
-}
 
 test('列出目標 repo 的既有標籤，輸出單行 JSON 且 exit 0', async (t) => {
   const stub = await withStub(t);
diff --git a/test/preflight.test.js b/test/preflight.test.js
index 6297b2e..1872f3e 100644
--- a/test/preflight.test.js
+++ b/test/preflight.test.js
@@ -1,17 +1,14 @@
 import test from 'node:test';
 import assert from 'node:assert/strict';
 import { runScript, pathWithOnly } from './helpers/run-script.js';
-import { startStubGitea, healthyRoutes } from './helpers/stub-gitea.js';
+import { healthyRoutes, stubEnv as envFor, withStubGitea } from './helpers/stub-gitea.js';
 
 const REPO = 'plugins/tea-sdlc';
 
 async function withStub(t, overrides = {}) {
-  const stub = await startStubGitea(healthyRoutes(REPO, overrides));
-  t.after(() => stub.close());
-  return stub;
+  return withStubGitea(t, healthyRoutes(REPO, overrides));
 }
 
-const envFor = (stub) => ({ TEA_SDLC_API_BASE: stub.base, TEA_SDLC_TOKEN: 'stub-token' });
 
 // ── 第一層：執行環境 ────────────────────────────────────────────────
 
diff --git a/test/script-contract.test.js b/test/script-contract.test.js
index 413d91c..1c0037a 100644
--- a/test/script-contract.test.js
+++ b/test/script-contract.test.js
@@ -6,17 +6,14 @@
 import test from 'node:test';
 import assert from 'node:assert/strict';
 import { runScript } from './helpers/run-script.js';
-import { startStubGitea, healthyRoutes } from './helpers/stub-gitea.js';
+import { healthyRoutes, stubEnv as envFor, withStubGitea } from './helpers/stub-gitea.js';
 
 const REPO = 'plugins/tea-sdlc';
 
 async function withStub(t, overrides = {}) {
-  const stub = await startStubGitea(healthyRoutes(REPO, overrides));
-  t.after(() => stub.close());
-  return stub;
+  return withStubGitea(t, healthyRoutes(REPO, overrides));
 }
 
-const envFor = (stub) => ({ TEA_SDLC_API_BASE: stub.base, TEA_SDLC_TOKEN: 'stub-token' });
 
 // ── 輸入：具名 flag ────────────────────────────────────────────────