Fix analyzer hints and warnings in test/.

test/run/resource_test.dart

Index: test/run/resource_test.dart
diff --git a/test/run/resource_test.dart b/test/run/resource_test.dart
index 99775195ce6d37972ad5f2991931143130145a0c..9ea7dca899159ad18576c8ebd17260c67a1ef709 100644
--- a/test/run/resource_test.dart
+++ b/test/run/resource_test.dart
@@ -2,9 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'dart:async';
-
-import 'package:path/path.dart' as p;
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../descriptor.dart' as d;