More fixes for testing under windows

pkg/analyzer/test/file_system/resource_uri_resolver_test.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 analyzer.test.file_system.resource_uri_resolver_test;
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 import 'package:unittest/unittest.dart';
 
 import '../utils.dart';
 
 main() {
   initializeTestEnvironment();
   defineReflectiveTests(ResourceUriResolverTest);
 }
 
 @reflectiveTest
 class ResourceUriResolverTest {
   MemoryResourceProvider provider;
   ResourceUriResolver resolver;
 
   void setUp() {
     provider = new MemoryResourceProvider();
     resolver = new ResourceUriResolver(provider);
-    provider.newFile('/test.dart', '');
-    provider.newFolder('/folder');
+    provider.newFile(provider.convertPath('/test.dart'), '');
+    provider.newFolder(provider.convertPath('/folder'));
   }
 
   void test_creation() {
     expect(provider, isNotNull);
     expect(resolver, isNotNull);
   }
 
   void test_resolveAbsolute_file() {
-    var uri = new Uri(scheme: 'file', path: '/test.dart');
+    var uri = provider.pathContext.toUri(provider.convertPath('/test.dart'));
     Source source = resolver.resolveAbsolute(uri);
     expect(source, isNotNull);
     expect(source.exists(), isTrue);
-    expect(source.fullName, '/test.dart');
+    expect(source.fullName, provider.convertPath('/test.dart'));
   }
 
   void test_resolveAbsolute_folder() {
-    var uri = new Uri(scheme: 'file', path: '/folder');
+    var uri = provider.pathContext.toUri(provider.convertPath('/folder'));
     Source source = resolver.resolveAbsolute(uri);
     expect(source, isNull);
   }
 
   void test_resolveAbsolute_notFile_dartUri() {
     var uri = new Uri(scheme: 'dart', path: 'core');
     Source source = resolver.resolveAbsolute(uri);
     expect(source, isNull);
   }
 
   void test_resolveAbsolute_notFile_httpsUri() {
     var uri = new Uri(scheme: 'https', path: '127.0.0.1/test.dart');
     Source source = resolver.resolveAbsolute(uri);
     expect(source, isNull);
   }
 
   void test_restoreAbsolute() {
-    var uri = new Uri(scheme: 'file', path: '/test.dart');
+    var uri = provider.pathContext.toUri(provider.convertPath('/test.dart'));
     Source source = resolver.resolveAbsolute(uri);
     expect(source, isNotNull);
     expect(resolver.restoreAbsolute(source), uri);
     expect(
         resolver.restoreAbsolute(
             new NonExistingSource(source.fullName, null, null)),
         uri);
   }
 }