Add a package for authenticating via OAuth2.

pkg/oauth2/test/utils.dart

Index: pkg/oauth2/test/utils.dart
diff --git a/pkg/oauth2/test/utils.dart b/pkg/oauth2/test/utils.dart
new file mode 100644
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+++ b/pkg/oauth2/test/utils.dart
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+// Copyright (c) 2012, 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 utils;
+
+import '../../unittest/lib/unittest.dart';
+import '../../http/lib/http.dart' as http;
+import '../../http/lib/testing.dart';
+import '../lib/oauth2.dart' as oauth2;
+
+class ExpectClient extends MockClient {
+  final Queue<MockClientHandler> _handlers;
+
+  ExpectClient._(MockClientHandler fn)
+    : _handlers = new Queue<MockClientHandler>(),
+      super(fn);
+
+  factory ExpectClient() {
+    var client;
+    client = new ExpectClient._((request) =>
+        client._handleRequest(request));
+    return client;
+  }
+
+  void expectRequest(MockClientHandler fn) {
+    var completer = new Completer();
+    expect(completer.future, completes);
+
+    _handlers.add((request) {
+      completer.complete(null);
+      return fn(request);
+    });
+  }
+
+  Future<http.Response> _handleRequest(http.Request request) {
+    if (_handlers.isEmpty) {
+      return new Future.immediate(new http.Response('not found', 404));
+    } else {
+      return _handlers.removeFirst()(request);
+    }
+  }
+}
+
+// TODO(nweiz): remove this once it's built in to unittest
+/// A matcher for StateErrors.
+const isStateError = const _StateError();
+
+/// A matcher for functions that throw StateError.
+const Matcher throwsStateError =
+    const Throws(isStateError);
+
+class _StateError extends TypeMatcher {
+  const _StateError() : super("StateError");
+  bool matches(item, MatchState matchState) => item is StateError;
+}
+
+/// A matcher for AuthorizationExceptions.
+const isAuthorizationException = const _AuthorizationException();
+
+/// A matcher for functions that throw AuthorizationException.
+const Matcher throwsAuthorizationException =
+    const Throws(isAuthorizationException);
+
+class _AuthorizationException extends TypeMatcher {
+  const _AuthorizationException() : super("AuthorizationException");
+  bool matches(item, MatchState matchState) =>
+    item is oauth2.AuthorizationException;
+}