Fix InSummarySourceTest on Windows.

pkg/analyzer/test/src/summary/in_summary_source_test.dart

 // Copyright (c) 2016, 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.summary.in_summary_source_test;
 
 import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/summary/format.dart';
 import 'package:analyzer/src/summary/idl.dart';
 import 'package:analyzer/src/summary/package_bundle_reader.dart';
+import 'package:path/path.dart';
 import 'package:unittest/unittest.dart';
 
 import '../../reflective_tests.dart';
 
 main() {
   groupSep = ' | ';
   runReflectiveTests(InSummarySourceTest);
 }
 
 @reflectiveTest
 class InSummarySourceTest extends ReflectiveTest {
   test_fallbackPath() {
+    String fooFallbackPath = absolute('path', 'to', 'foo.dart');
     var sourceFactory = new SourceFactory([
       new InSummaryPackageUriResolver(new MockSummaryDataStore.fake(
           {'package:foo/foo.dart': 'foo.sum',},
-          uriToFallbackModePath: {'package:foo/foo.dart': '/path/to/foo.dart'}))
+          uriToFallbackModePath: {'package:foo/foo.dart': fooFallbackPath}))
     ]);
 
     InSummarySource source = sourceFactory.forUri('package:foo/foo.dart');
     expect(source, new isInstanceOf<FileBasedSource>());
-    expect(source.fullName, '/path/to/foo.dart');
+    expect(source.fullName, fooFallbackPath);
   }
 
   test_InSummarySource() {
     var sourceFactory = new SourceFactory([
       new InSummaryPackageUriResolver(new MockSummaryDataStore.fake({
         'package:foo/foo.dart': 'foo.sum',
         'package:foo/src/foo_impl.dart': 'foo.sum',
         'package:bar/baz.dart': 'bar.sum',
       }))
     ]);
@@ skipping 25 matching lines @@
     // We don't populate the values as it is not needed for the test.
     var unlinkedMap = new Map<String, UnlinkedUnit>.fromIterable(
         uriToSummary.keys,
         value: (uri) => new UnlinkedUnitBuilder(
             fallbackModePath: uriToFallbackModePath[uri]));
     return new MockSummaryDataStore(null, unlinkedMap, uriToSummary);
   }
 
   noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
 }