Remove AsyncError with Expando.

pkg/oauth2/test/credentials_test.dart

 // 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 credentials_test;
 
 import 'dart:async';
 import 'dart:io';
 import 'dart:json' as JSON;
 import 'dart:uri';
@@ skipping 28 matching lines @@
     var credentials = new oauth2.Credentials(
         'access token', null, null, null, expiration);
     expect(credentials.isExpired, isTrue);
   });
 
   test("can't refresh without a refresh token", () {
     var credentials = new oauth2.Credentials(
         'access token', null, tokenEndpoint);
     expect(credentials.canRefresh, false);
     credentials.refresh('identifier', 'secret', httpClient: httpClient)
-        .catchError(expectAsync1((e) {
-          expect(e.error is StateError, isTrue);
+        .catchError(expectAsync1((error) {
+          expect(error is StateError, isTrue);
         }));
   });
 
   test("can't refresh without a token endpoint", () {
     var credentials = new oauth2.Credentials('access token', 'refresh token');
     expect(credentials.canRefresh, false);
     credentials.refresh('identifier', 'secret', httpClient: httpClient)
-        .catchError(expectAsync1((e) {
-          expect(e.error is StateError, isTrue);
+        .catchError(expectAsync1((error) {
+          expect(error is StateError, isTrue);
         }));
   });
 
   test("can refresh with a refresh token and a token endpoint", () {
     var credentials = new oauth2.Credentials(
         'access token', 'refresh token', tokenEndpoint, ['scope1', 'scope2']);
     expect(credentials.canRefresh, true);
 
     httpClient.expectRequest((request) {
       expect(request.method, equals('POST'));
@@ skipping 101 matching lines @@
       expect(() => fromMap({"accessToken": "foo", "scopes": 12}),
           throwsFormatException);
     });
 
     test("should throw a FormatException if expiration is not an int", () {
       expect(() => fromMap({"accessToken": "foo", "expiration": "12"}),
           throwsFormatException);
     });
   });
 }