fix source restoreUri test

pkg/analyzer/test/src/context/source_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.src.context.source_test;
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/context/source.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:package_config/packages.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import 'abstract_context.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(SourceFactoryImplTest);
   });
 }
 
 @reflectiveTest
 class SourceFactoryImplTest extends AbstractContextTest {
   void test_restoreUri() {
-    Map<String, Uri> packageUriMap = <String, Uri>{
-      'foo': Uri.parse('file:///pkgs/somepkg/lib/')
-    };
+    String libPath = resourceProvider.convertPath('/pkgs/somepkg/lib/');
+    Uri libUri = resourceProvider.getFolder(libPath).toUri();
+    Map<String, Uri> packageUriMap = <String, Uri>{'foo': libUri};
     SourceFactoryImpl sourceFactory = new SourceFactoryImpl(
       <UriResolver>[new ResourceUriResolver(resourceProvider)],
       new _MockPackages(packageUriMap),
     );
-    Uri uri = sourceFactory.restoreUri(newSource('/pkgs/somepkg/lib'));
-    // TODO(danrubel) fix on Windows
-    if (resourceProvider.absolutePathContext.separator != r'\') {
+    Source libSource = newSource('/pkgs/somepkg/lib');
+    Uri uri = sourceFactory.restoreUri(libSource);
+    try {
       expect(uri, Uri.parse('package:foo/'));
+    } catch (e) {
+      print('=== debug info ===');
+      print('libPath: $libPath');
+      print('libUri: $libUri');
+      print('libSource: ${libSource?.fullName}');
+      rethrow;
     }
   }
 }
 
 /**
  * An implementation of [Packages] used for testing.
  */
 class _MockPackages implements Packages {
   final Map<String, Uri> map;
 
   _MockPackages(this.map);
 
   @override
   Iterable<String> get packages => map.keys;
 
   @override
   Map<String, Uri> asMap() => map;
 
   @override
   Uri resolve(Uri packageUri, {Uri notFound(Uri packageUri)}) {
     fail('Unexpected invocation of resolve');
     return null;
   }
 }