Include the common library name used in 'part of' directives.

pkg/analyzer/test/src/task/dart_test.dart

 // Copyright (c) 2015, 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 test.src.task.dart_test;
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/src/context/cache.dart';
 import 'package:analyzer/src/generated/ast.dart';
@@ skipping 537 matching lines @@
     {
       CompilationUnitElement unitElement = partUnits[1].element;
       expect(unitElement.uri, 'part2.dart');
       expect(unitElement.uriOffset, 37);
       expect(unitElement.uriEnd, 49);
       expect((libraryUnit.directives[2] as PartDirective).element,
           same(unitElement));
     }
   }
 
-  test_perform_error_missingLibraryDirectiveWithPart() {
+  test_perform_error_missingLibraryDirectiveWithPart_hasCommon() {
     _performBuildTask({
       '/lib.dart': '''
-part 'part.dart';
+part 'partA.dart';
+part 'partB.dart';
 ''',
-      '/part.dart': '''
-part of lib;
+      '/partA.dart': '''
+part of my_lib;
+        ''',
+      '/partB.dart': '''
+part of my_lib;
 '''
     });
     _assertErrorsWithCodes(
         [ResolverErrorCode.MISSING_LIBRARY_DIRECTIVE_WITH_PART]);
+    AnalysisErrorWithProperties error = errorListener.errors[0];

[Brian Wilkerson, 2015/03/15 23:28:14]

"AnalysisErrorWithProperties" --> "AnalysisError"

[scheglov, 2015/03/15 23:38:15]

Done.

+    expect(error.getProperty(ErrorProperty.PARTS_LIBRARY_NAME), 'my_lib');
+  }
+
+  test_perform_error_missingLibraryDirectiveWithPart_noCommon() {
+    _performBuildTask({
+      '/lib.dart': '''
+part 'partA.dart';
+part 'partB.dart';
+''',
+      '/partA.dart': '''
+part of libA;
+        ''',
+      '/partB.dart': '''
+part of libB;
+'''
+    });
+    _assertErrorsWithCodes(
+        [ResolverErrorCode.MISSING_LIBRARY_DIRECTIVE_WITH_PART]);
+    AnalysisErrorWithProperties error = errorListener.errors[0];

[Brian Wilkerson, 2015/03/15 23:28:14]

"AnalysisErrorWithProperties" --> "AnalysisError"

[scheglov, 2015/03/15 23:38:15]

Done.

+    expect(error.getProperty(ErrorProperty.PARTS_LIBRARY_NAME), isNull);
   }
 
   test_perform_error_partOfDifferentLibrary() {
     _performBuildTask({
       '/lib.dart': '''
 library lib;
 part 'part.dart';
 ''',
       '/part.dart': '''
 part of someOtherLib;
@@ skipping 410 matching lines @@
     return entryMap.putIfAbsent(target, () => new CacheEntry());
   }
 
   TimestampedData<String> getContents(Source source) => source.contents;
 
   noSuchMethod(Invocation invocation) {
     print('noSuchMethod: ${invocation.memberName}');
     return super.noSuchMethod(invocation);
   }
 }