Wait an extra second if we can't delete the directory yet

Author: srujzs

dwds/test/fixtures/context.dart

@@ -548,7 +548,7 @@ class TestContext {
     _client?.close();
     await _outputDir?.delete(recursive: true);
     stopLogWriter();
-    project.tearDown();
+    await project.tearDown();
 
     // clear the state for next setup
     _webDriver = null;

dwds/test/fixtures/project.dart

@@ -252,9 +252,16 @@ class TestProject {
   }
 
   /// Delete the project if we made a copy.
-  void tearDown() {
+  Future<void> tearDown() async {
     if (editable) {
-      _fixturesCopy.deleteSync(recursive: true);
+      try {
+        _fixturesCopy.deleteSync(recursive: true);
+      } on FileSystemException catch (_) {
+        // On Windows, the build daemon process might still be accessing the
+        // working directory, so wait a second and then try again.
+        await Future.delayed(const Duration(seconds: 1));
+        _fixturesCopy.deleteSync(recursive: true);
+      }
     }
   }