Clean up the semantics of package descriptions.

test/lock_file_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 lock_file_test;
 
 import 'dart:async';
 
 import 'package:pub/src/lock_file.dart';
 import 'package:pub/src/package.dart';
 import 'package:pub/src/pubspec.dart';
 import 'package:pub/src/source.dart';
 import 'package:pub/src/source_registry.dart';
 import 'package:pub_semver/pub_semver.dart';
 import 'package:test/test.dart';
 import 'package:yaml/yaml.dart';
 
 import 'test_pub.dart';
 
 class MockSource extends Source {
   final String name = 'mock';
 
+  Future<List<PackageId>> doGetVersions(PackageRef ref) =>
+      throw new UnsupportedError("Cannot get mock package versions.");
+
   Future<Pubspec> doDescribe(PackageId id) => throw new UnsupportedError(
       "Cannot describe mock packages.");
 
   Future get(PackageId id, String symlink) => throw new UnsupportedError(
       "Cannot get a mock package.");
 
   String getDirectory(PackageId id) => throw new UnsupportedError(
       "Cannot get the directory for mock packages.");
 
-  dynamic parseDescription(String filePath, String description,
-                           {bool fromLockFile: false}) {
-    if (!description.endsWith(' desc')) throw new FormatException();
-    return description;
+  PackageRef parseRef(String name, description, {String containingPath}) {
+    if (!description.endsWith(' desc')) throw new FormatException('Bad');
+    return new PackageRef(name, this.name, description);
+  }
+
+  PackageId parseId(String name, Version version, description) {
+    if (!description.endsWith(' desc')) throw new FormatException('Bad');
+    return new PackageId(name, this.name, version, description);
   }
 
   bool descriptionsEqual(description1, description2) =>
       description1 == description2;
 
   String packageName(String description) {
     // Strip off ' desc'.
     return description.substring(0, description.length - 5);
   }
 }
@@ skipping 167 matching lines @@
           'bar': {
             'version': '3.2.1',
             'source': 'mock',
             'description': 'bar desc'
           }
         }
       }));
     });
   });
 }