diff --git a/scripts/test-planner/executor.mjs b/scripts/test-planner/executor.mjs
index 343547feea5..761d81a77dd 100644
--- a/scripts/test-planner/executor.mjs
+++ b/scripts/test-planner/executor.mjs
@@ -343,6 +343,7 @@ const partitionUnitsBySurface = (units, surface) => {
 export async function executePlan(plan, options = {}) {
   const env = options.env ?? process.env;
   const artifacts = options.artifacts ?? createExecutionArtifacts(env);
+  const spawnImpl = options.spawn ?? spawn;
   const pnpmInvocation = resolvePnpmCommandInvocation({
     npmExecPath: env.npm_execpath,
     nodeExecPath: process.execPath,
@@ -740,7 +741,7 @@ export async function executePlan(plan, options = {}) {
           childEnv.OPENCLAW_VITEST_FS_MODULE_CACHE_PATH = vitestFsModuleCachePath;
           laneLogStream.write(`[test-parallel] fsModuleCachePath=${vitestFsModuleCachePath}\n`);
         }
-        child = spawn(pnpmInvocation.command, spawnArgs, {
+        child = spawnImpl(pnpmInvocation.command, spawnArgs, {
           stdio: ["inherit", "pipe", "pipe"],
           env: childEnv,
           shell: false,
diff --git a/test/scripts/test-planner.executor-fallback.test.ts b/test/scripts/test-planner.executor-fallback.test.ts
index 91678863c77..b8dbe3ce51b 100644
--- a/test/scripts/test-planner.executor-fallback.test.ts
+++ b/test/scripts/test-planner.executor-fallback.test.ts
@@ -1,7 +1,7 @@
 import { EventEmitter } from "node:events";
 import { PassThrough } from "node:stream";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
-import { importFreshModule } from "../helpers/import-fresh.js";
+import { createExecutionArtifacts, executePlan } from "../../scripts/test-planner/executor.mjs";
 
 beforeEach(() => {
   vi.spyOn(console, "log").mockImplementation(() => {});
@@ -13,7 +13,6 @@ beforeEach(() => {
 afterEach(() => {
   vi.useRealTimers();
   vi.restoreAllMocks();
-  vi.resetModules();
 });
 
 describe("test planner executor", () => {
@@ -33,13 +32,6 @@ describe("test planner executor", () => {
       }, 0);
       return fakeChild;
     });
-    vi.doMock("node:child_process", () => ({
-      spawn: spawnMock,
-    }));
-
-    const { executePlan, createExecutionArtifacts } = await importFreshModule<
-      typeof import("../../scripts/test-planner/executor.mjs")
-    >(import.meta.url, "../../scripts/test-planner/executor.mjs?scope=exit-fallback");
     const artifacts = createExecutionArtifacts({ OPENCLAW_TEST_CLOSE_GRACE_MS: "10" });
     const executePromise = executePlan(
       {
@@ -51,6 +43,7 @@ describe("test planner executor", () => {
       {
         env: { OPENCLAW_TEST_CLOSE_GRACE_MS: "10" },
         artifacts,
+        spawn: spawnMock,
       },
     );
 
@@ -93,13 +86,6 @@ describe("test planner executor", () => {
       }, 0);
       return child;
     });
-    vi.doMock("node:child_process", () => ({
-      spawn: spawnMock,
-    }));
-
-    const { executePlan, createExecutionArtifacts } = await importFreshModule<
-      typeof import("../../scripts/test-planner/executor.mjs")
-    >(import.meta.url, "../../scripts/test-planner/executor.mjs?scope=collect-all");
     const artifacts = createExecutionArtifacts({});
     const report = await executePlan(
       {
@@ -125,6 +111,7 @@ describe("test planner executor", () => {
       {
         env: {},
         artifacts,
+        spawn: spawnMock,
       },
     );
 
@@ -159,13 +146,6 @@ describe("test planner executor", () => {
       }, 0);
       return fakeChild;
     });
-    vi.doMock("node:child_process", () => ({
-      spawn: spawnMock,
-    }));
-
-    const { executePlan, createExecutionArtifacts } = await importFreshModule<
-      typeof import("../../scripts/test-planner/executor.mjs")
-    >(import.meta.url, "../../scripts/test-planner/executor.mjs?scope=localstorage-file");
     const artifacts = createExecutionArtifacts({
       NODE_OPTIONS: "--max_old_space_size=4096 --localstorage-file",
     });
@@ -193,6 +173,7 @@ describe("test planner executor", () => {
             NODE_OPTIONS: "--max_old_space_size=4096 --localstorage-file",
           },
           artifacts,
+          spawn: spawnMock,
         },
       ),
     ).resolves.toMatchObject({