Try waiting a few seconds before renaming

extensions/ql-vscode/test/vscode-tests/cli-integration/jest.setup.ts

@@ -11,6 +11,8 @@ import { DB_URL, dbLoc, testprojLoc } from "../global.helper";
 import fetch from "node-fetch";
 import { renameSync } from "fs";
 import { unzipToDirectoryConcurrently } from "../../../src/common/unzip-concurrently";
+import { platform } from "os";
+import { wait } from "./utils";
 
 beforeAll(async () => {
   // ensure the test database is downloaded
@@ -37,6 +39,11 @@ beforeAll(async () => {
   if (!existsSync(testprojLoc)) {
     console.log(`Unzipping test database to ${testprojLoc}`);
     await unzipToDirectoryConcurrently(dbLoc, dbParentDir);
+    // On Windows, wait a few seconds to make sure all background processes
+    // release their lock on the files before renaming the directory.
+    if (platform() === "win32") {
+      await wait(3000);
+    }
     renameSync(join(dbParentDir, "db"), testprojLoc);
     console.log("Unzip completed.");
   }

extensions/ql-vscode/test/vscode-tests/cli-integration/utils.ts

@@ -7,3 +7,7 @@ import { join } from "path";
 export function getDataFolderFilePath(path: string): string {
   return join(workspace.workspaceFolders![0].uri.fsPath, path);
 }
+
+export async function wait(ms = 1000) {
+  return new Promise((resolve) => setTimeout(resolve, ms));
+}

extensions/ql-vscode/test/vscode-tests/minimal-workspace/local-queries/local-databases.test.ts

@@ -101,6 +101,9 @@ describe("local databases", () => {
         onStart: () => {
           /**/
         },
+        onQueryRunStarting: () => {
+          /**/
+        },
       }),
       mockedObject<CodeQLCliServer>({
         resolveDatabase: resolveDatabaseSpy,