Add appengine/gcloud/mustache dependencies.

pkg/gcloud/test/datastore/error_matchers.dart

+// Copyright (c) 2014, 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 error_matchers;
+
+import 'package:unittest/unittest.dart';
+import 'package:gcloud/datastore.dart';
+
+class _ApplicationError extends TypeMatcher {
+  const _ApplicationError() : super("ApplicationError");
+  bool matches(item, Map matchState) => item is ApplicationError;
+}
+
+
+class _DataStoreError extends TypeMatcher {
+  const _DataStoreError() : super("DataStoreError");
+  bool matches(item, Map matchState) => item is DatastoreError;
+}
+
+class _TransactionAbortedError extends TypeMatcher {
+  const _TransactionAbortedError() : super("TransactionAbortedError");
+  bool matches(item, Map matchState) => item is TransactionAbortedError;
+}
+
+class _NeedIndexError extends TypeMatcher {
+  const _NeedIndexError() : super("NeedIndexError");
+  bool matches(item, Map matchState) => item is NeedIndexError;
+}
+
+class _TimeoutError extends TypeMatcher {
+  const _TimeoutError() : super("TimeoutError");
+  bool matches(item, Map matchState) => item is TimeoutError;
+}
+
+
+class _IntMatcher extends TypeMatcher {
+  const _IntMatcher() : super("IntMatcher");
+  bool matches(item, Map matchState) => item is int;
+}
+
+const isApplicationError = const _ApplicationError();
+
+const isDataStoreError = const _DataStoreError();
+const isTransactionAbortedError = const _TransactionAbortedError();
+const isNeedIndexError = const _NeedIndexError();
+const isTimeoutError = const _TimeoutError();
+
+const isInt = const _IntMatcher();