Don't extract the name of a package from its description.

utils/tests/pub/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('../../../pkg/unittest/unittest.dart');
 #import('../../pub/lock_file.dart');
 #import('../../pub/package.dart');
 #import('../../pub/source.dart');
 #import('../../pub/source_registry.dart');
 #import('../../pub/utils.dart');
 #import('../../pub/version.dart');
 #import('../../pub/yaml/yaml.dart');
 
 class MockSource extends Source {
   final String name = 'mock';
   final bool shouldCache = false;
 
   void validateDescription(String description, [bool fromLockFile=false]) {
-    description.endsWith(' desc');
+    if (!description.endsWith(' desc')) throw new FormatException();
   }
 
   String packageName(String description) {
     // Strip off ' desc'.
     return description.substring(0, description.length - 5);
   }
 }
 
 main() {
   var sources = new SourceRegistry();
@@ skipping 102 matching lines @@
           new LockFile.parse('''
 packages:
   foo:
     version: 1.2.3
     source: mock
     description: foo desc is bad
 ''', sources);
         }, throwsFormatException);
       });
 
-      test("throws if the source name doesn't match the given name", () {
-        expect(() {
-          new LockFile.parse('''
-packages:
-  foo:
-    version: 1.2.3
-    source: mock
-    description: notfoo desc
-''', sources);
-        }, throwsFormatException);
-      });
-
       test("ignores extra stuff in file", () {
         var lockFile = new LockFile.parse('''
 extra:
   some: stuff
 packages:
   foo:
     bonus: not used
     version: 1.2.3
     source: mock
     description: foo desc
 ''', sources);
       });
     });
 
     group('serialize()', () {
       test('dumps the lockfile to YAML', () {
         var lockfile = new LockFile.empty();
-        lockfile.packages['foo'] =
-          new PackageId(mockSource, new Version.parse('1.2.3'), 'foo desc');
-        lockfile.packages['bar'] =
-          new PackageId(mockSource, new Version.parse('3.2.1'), 'bar desc');
+        lockfile.packages['foo'] = new PackageId(
+            'foo', mockSource, new Version.parse('1.2.3'), 'foo desc');
+        lockfile.packages['bar'] = new PackageId(
+            'foo', mockSource, new Version.parse('3.2.1'), 'bar desc');
 
         expect(loadYaml(lockfile.serialize()), equals({
           'packages': {
             'foo': {
               'version': '1.2.3',
               'source': 'mock',
               'description': 'foo desc'
             },
             'bar': {
               'version': '3.2.1',
               'source': 'mock',
               'description': 'bar desc'
             }
           }
         }));
       });
     });
   });
 }