From a30dae3c7128bed82e09e95d35e339ae125ca3f9 Mon Sep 17 00:00:00 2001
From: Peter Steinberger <steipete@gmail.com>
Date: Fri, 27 Mar 2026 07:53:57 +0000
Subject: [PATCH] fix: honor test planner cache paths by target platform

---
 scripts/test-planner/executor.mjs |  3 ++-
 test/scripts/test-planner.test.ts | 13 +++++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/scripts/test-planner/executor.mjs b/scripts/test-planner/executor.mjs
index f59e3e883ef..60fe6a622e3 100644
--- a/scripts/test-planner/executor.mjs
+++ b/scripts/test-planner/executor.mjs
@@ -146,7 +146,8 @@ export const resolveVitestFsModuleCachePath = ({
   if (explicitPath) {
     return explicitPath;
   }
-  return path.join(
+  const pathImpl = isWindowsEnv(env, platform) ? path.win32 : path.posix;
+  return pathImpl.join(
     cwd,
     "node_modules",
     ".experimental-vitest-cache",
diff --git a/test/scripts/test-planner.test.ts b/test/scripts/test-planner.test.ts
index 99fd6a0f2fa..aeab331af5b 100644
--- a/test/scripts/test-planner.test.ts
+++ b/test/scripts/test-planner.test.ts
@@ -421,6 +421,19 @@ describe("resolveVitestFsModuleCachePath", () => {
     ).toBe("/repo/node_modules/.experimental-vitest-cache/unit-fast-1");
   });
 
+  it("honors the requested Windows platform when building the cache path", () => {
+    expect(
+      resolveVitestFsModuleCachePath({
+        cwd: "/repo",
+        env: {
+          OPENCLAW_VITEST_FS_MODULE_CACHE: "1",
+        },
+        platform: "win32",
+        unitId: "unit-fast-1",
+      }),
+    ).toBe("\\repo\\node_modules\\.experimental-vitest-cache\\unit-fast-1");
+  });
+
   it("respects an explicit cache path override", () => {
     expect(
       resolveVitestFsModuleCachePath({