fix SourceFactoryImpl restoreUri

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/')
+    };
+    SourceFactoryImpl sourceFactory = new SourceFactoryImpl(
+      <UriResolver>[new ResourceUriResolver(resourceProvider)],
+      new _MockPackages(packageUriMap),
+    );
+    Uri uri = sourceFactory.restoreUri(newSource('/pkgs/somepkg/lib'));
+    expect(uri, Uri.parse('package:foo/'));
+  }
+}
+
+/**
+ * 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;
+  }
+}