Change analysis server protocol to omit empty lists when optional.

pkg/analysis_server/test/services/correction/change_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.change;
 
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/protocol2.dart' show SourceEdit,
     SourceFileEdit, Position;
 import 'package:analysis_server/src/services/correction/change.dart';
@@ skipping 26 matching lines @@
     expect(change.fileEdits, hasLength(1));
     {
       SourceFileEdit fileEdit = change.getFileEdit('/a.dart');
       expect(fileEdit, isNotNull);
       expect(fileEdit.edits, unorderedEquals([edit1, edit2]));
     }
   }
 
   void test_getFileEdit() {
     Change change = new Change('msg');
-    SourceFileEdit fileEdit = new SourceFileEdit('/a.dart', <SourceEdit>[]);
+    SourceFileEdit fileEdit = new SourceFileEdit('/a.dart');
     change.addFileEdit(fileEdit);
     expect(change.getFileEdit('/a.dart'), fileEdit);
   }
 
   void test_getFileEdit_empty() {
     Change change = new Change('msg');
     expect(change.getFileEdit('/some.dart'), isNull);
   }
 
   void test_toJson() {
     Change change = new Change('msg');
-    change.addFileEdit(new SourceFileEdit('/a.dart', <SourceEdit>[])
+    change.addFileEdit(new SourceFileEdit('/a.dart')
         ..add(new SourceEdit(1, 2, 'aaa'))
         ..add(new SourceEdit(10, 20, 'bbb')));
-    change.addFileEdit(new SourceFileEdit('/b.dart', <SourceEdit>[])
+    change.addFileEdit(new SourceFileEdit('/b.dart')
         ..add(new SourceEdit(21, 22, 'xxx'))
         ..add(new SourceEdit(210, 220, 'yyy')));
     {
       var group = new LinkedEditGroup();
       change.addLinkedEditGroup(group
           ..addPosition(new Position('/ga.dart', 1), 2)
           ..addPosition(new Position('/ga.dart', 10), 2));
       group.addSuggestion(
           new LinkedEditSuggestion(LinkedEditSuggestionKind.TYPE, 'AA'));
       group.addSuggestion(
@@ skipping 116 matching lines @@
 }
 
 
 @ReflectiveTestCase()
 class FileEditTest {
   void test_addAll() {
     SourceEdit edit1a = new SourceEdit(1, 0, 'a1');
     SourceEdit edit1b = new SourceEdit(1, 0, 'a2');
     SourceEdit edit10 = new SourceEdit(10, 1, 'b');
     SourceEdit edit100 = new SourceEdit(100, 2, 'c');
-    SourceFileEdit fileEdit = new SourceFileEdit('/test.dart', <SourceEdit>[]);
+    SourceFileEdit fileEdit = new SourceFileEdit('/test.dart');
     fileEdit.addAll([edit100, edit1a, edit10, edit1b]);
     expect(fileEdit.edits, [edit100, edit10, edit1b, edit1a]);
   }
 
   void test_add_sorts() {
     SourceEdit edit1a = new SourceEdit(1, 0, 'a1');
     SourceEdit edit1b = new SourceEdit(1, 0, 'a2');
     SourceEdit edit10 = new SourceEdit(10, 1, 'b');
     SourceEdit edit100 = new SourceEdit(100, 2, 'c');
-    SourceFileEdit fileEdit = new SourceFileEdit('/test.dart', <SourceEdit>[]);
+    SourceFileEdit fileEdit = new SourceFileEdit('/test.dart');
     fileEdit.add(edit100);
     fileEdit.add(edit1a);
     fileEdit.add(edit1b);
     fileEdit.add(edit10);
     expect(fileEdit.edits, [edit100, edit10, edit1b, edit1a]);
   }
 
   void test_new() {
-    SourceFileEdit fileEdit = new SourceFileEdit('/test.dart', <SourceEdit>[]);
+    SourceFileEdit fileEdit = new SourceFileEdit('/test.dart');
     fileEdit.add(new SourceEdit(1, 2, 'aaa'));
     fileEdit.add(new SourceEdit(10, 20, 'bbb'));
     expect(
         fileEdit.toString(),
         '{"file":"/test.dart","edits":['
             '{"offset":10,"length":20,"replacement":"bbb"},'
             '{"offset":1,"length":2,"replacement":"aaa"}]}');
   }
 
   void test_toJson() {
-    SourceFileEdit fileEdit = new SourceFileEdit('/test.dart', <SourceEdit>[]);
+    SourceFileEdit fileEdit = new SourceFileEdit('/test.dart');
     fileEdit.add(new SourceEdit(1, 2, 'aaa'));
     fileEdit.add(new SourceEdit(10, 20, 'bbb'));
     var expectedJson = {
       FILE: '/test.dart',
       EDITS: [{
           OFFSET: 10,
           LENGTH: 20,
           REPLACEMENT: 'bbb'
         }, {
           OFFSET: 1,
@@ skipping 90 matching lines @@
 
   void test_toJson() {
     Position position = new Position('/test.dart', 1);
     var expectedJson = {
       FILE: '/test.dart',
       OFFSET: 1
     };
     expect(position.toJson(), expectedJson);
   }
 }