Modernize the style.

test/client_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 client_test;
-
 import 'dart:async';
 import 'dart:convert';
 
 import 'package:http/http.dart' as http;
 import 'package:oauth2/oauth2.dart' as oauth2;
 import 'package:test/test.dart';
 
 import 'utils.dart';
 
 final Uri requestUri = Uri.parse("http://example.com/resource");
 
 final Uri tokenEndpoint = Uri.parse('http://example.com/token');
 
-ExpectClient httpClient;
+void main() {
+  var httpClient;
+  setUp(() => httpClient = new ExpectClient());
 
-void createHttpClient() {
-  httpClient = new ExpectClient();
-}
-
-void main() {
   group('with expired credentials', () {
-    setUp(createHttpClient);
-
     test("that can't be refreshed throws an ExpirationException on send", () {
       var expiration = new DateTime.now().subtract(new Duration(hours: 1));
       var credentials = new oauth2.Credentials(
           'access token', null, null, [], expiration);
       var client = new oauth2.Client('identifier', 'secret', credentials,
           httpClient: httpClient);
 
       expect(client.get(requestUri),
           throwsA(new isInstanceOf<oauth2.ExpirationException>()));
     });
@@ skipping 23 matching lines @@
 
         return new Future.value(new http.Response('good job', 200));
       });
 
       await client.read(requestUri);
       expect(client.credentials.accessToken, equals('new access token'));
     });
   });
 
   group('with valid credentials', () {
-    setUp(createHttpClient);
-
     test("sends a request with bearer authorization", () {
       var credentials = new oauth2.Credentials('access token');
       var client = new oauth2.Client('identifier', 'secret', credentials,
           httpClient: httpClient);
 
       httpClient.expectRequest((request) {
         expect(request.method, equals('GET'));
         expect(request.url.toString(), equals(requestUri.toString()));
         expect(request.headers['authorization'], equals('Bearer access token'));
 
@@ skipping 25 matching lines @@
     test("without a refresh token can't manually refresh the credentials", () {
       var credentials = new oauth2.Credentials('access token');
       var client = new oauth2.Client('identifier', 'secret', credentials,
           httpClient: httpClient);
 
       expect(client.refreshCredentials(), throwsA(isStateError));
     });
   });
 
   group('with invalid credentials', () {
-    setUp(createHttpClient);
-
     test('throws an AuthorizationException for a 401 response', () {
       var credentials = new oauth2.Credentials('access token');
       var client = new oauth2.Client('identifier', 'secret', credentials,
           httpClient: httpClient);
 
       httpClient.expectRequest((request) {
         expect(request.method, equals('GET'));
         expect(request.url.toString(), equals(requestUri.toString()));
         expect(request.headers['authorization'], equals('Bearer access token'));
 
@@ skipping 77 matching lines @@
             equals('Bearer access token'));
 
         return new Future.value(new http.Response('bad job', 401,
                 headers: {'www-authenticate': 'Bearer'}));
       });
 
       expect((await client.get(requestUri)).statusCode, equals(401));
     });
   });
 }