Quick Fix for creating a missing part file.

pkg/analysis_server/test/services/correction/fix_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 test.services.correction.fix;
 
 import 'package:analysis_server/src/protocol.dart' hide AnalysisError;
 import 'package:analysis_server/src/services/correction/fix.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/source/package_map_resolver.dart';
@@ skipping 841 matching lines @@
     change = fix.change;
     // validate change
     List<SourceFileEdit> fileEdits = change.edits;
     expect(fileEdits, hasLength(1));
     SourceFileEdit fileEdit = change.edits[0];
     expect(fileEdit.file, '/my/project/bin/my_file.dart');
     expect(fileEdit.fileStamp, -1);
     expect(fileEdit.edits[0].replacement, contains('library my.file;'));
   }
 
+  void test_createFile_forPart() {
+    testFile = '/my/project/bin/test.dart';
+    resolveTestUnit('''
+library my.lib;
+part 'my_part.dart';
+''');
+    AnalysisError error = _findErrorToFix();
+    fix = _assertHasFix(FixKind.CREATE_FILE, error);
+    change = fix.change;
+    // validate change
+    List<SourceFileEdit> fileEdits = change.edits;
+    expect(fileEdits, hasLength(1));
+    SourceFileEdit fileEdit = change.edits[0];
+    expect(fileEdit.file, '/my/project/bin/my_part.dart');
+    expect(fileEdit.fileStamp, -1);
+    expect(fileEdit.edits[0].replacement, contains('part of my.lib;'));
+  }
+
   void test_createGetter_BAD_inSDK() {
     resolveTestUnit('''
 main(List p) {
   int v = p.foo;
 }
 ''');
     assertNoFix(FixKind.CREATE_GETTER);
   }
 
   void test_createGetter_multiLevel() {
@@ skipping 2350 matching lines @@
 
   List<Position> _findResultPositions(List<String> searchStrings) {
     List<Position> positions = <Position>[];
     for (String search in searchStrings) {
       int offset = resultCode.indexOf(search);
       positions.add(new Position(testFile, offset));
     }
     return positions;
   }
 }