fix(test): retry rmSync with backoff on Windows EBUSY in embedding-regression afterAll (#1325)

Author: carlos-alm

tests/search/embedding-regression.test.ts

@@ -11,6 +11,7 @@ import os from 'node:os';
 import path from 'node:path';
 import Database from 'better-sqlite3';
 import { afterAll, beforeAll, describe, expect, type TestContext, test } from 'vitest';
+import { flushDeferredClose } from '../../src/db/index.js';
 
 // Detect whether transformers is available (optional dep)
 let hasTransformers = false;
@@ -81,7 +82,22 @@ describe.skipIf(!hasTransformers)('embedding regression (real model)', () => {
   }, 240_000);
 
   afterAll(() => {
-    if (tmpDir) fs.rmSync(tmpDir, { recursive: true, force: true });
+    if (!tmpDir) return;
+    // Flush any deferred DB closes before deleting the temp directory.
+    // On Windows, SQLite WAL files can remain locked briefly after db.close(),
+    // causing intermittent EBUSY errors. Retry up to 3 times with a short delay.
+    flushDeferredClose();
+    const sharedBuf = new SharedArrayBuffer(4);
+    const sharedArr = new Int32Array(sharedBuf);
+    for (let attempt = 0; attempt < 3; attempt++) {
+      try {
+        fs.rmSync(tmpDir, { recursive: true, force: true });
+        return;
+      } catch (err) {
+        if ((err as NodeJS.ErrnoException).code !== 'EBUSY' || attempt === 2) throw err;
+        Atomics.wait(sharedArr, 0, 0, 100);
+      }
+    }
   });
 
   describe('smoke tests', () => {