Split up some slow pub tests and mark some scheduled_test tests as slow.

utils/tests/pub/validator/utils.dart

Index: utils/tests/pub/validator/utils.dart
diff --git a/utils/tests/pub/validator/utils.dart b/utils/tests/pub/validator/utils.dart
new file mode 100644
index 0000000000000000000000000000000000000000..64a6b47d956e852302675676e05bcccc5154c703
--- /dev/null
+++ b/utils/tests/pub/validator/utils.dart
@@ -0,0 +1,23 @@
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// 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.
+
+library validator.utils;
+
+import 'package:scheduled_test/scheduled_test.dart';
+
+import '../test_pub.dart';
+
+void expectNoValidationError(ValidatorCreator fn) {
+  expect(schedulePackageValidation(fn), completion(pairOf(isEmpty, isEmpty)));
+}
+
+void expectValidationError(ValidatorCreator fn) {
+  expect(schedulePackageValidation(fn),
+      completion(pairOf(isNot(isEmpty), anything)));
+}
+
+void expectValidationWarning(ValidatorCreator fn) {
+  expect(schedulePackageValidation(fn),
+      completion(pairOf(isEmpty, isNot(isEmpty))));
+}