Add quick-fix to convert child: to children:

pkg/analysis_server/test/services/correction/assist_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.assist;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/edit/assist/assist_core.dart';
 import 'package:analysis_server/plugin/edit/assist/assist_dart.dart';
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/plugin/server_plugin.dart';
 import 'package:analysis_server/src/services/correction/assist.dart';
 import 'package:analysis_server/src/services/correction/assist_internal.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_resolution_map.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/source/package_map_resolver.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:plugin/manager.dart';
 import 'package:plugin/plugin.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../../abstract_single_unit.dart';
+import 'flutter_util.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(AssistProcessorTest);
     defineReflectiveTests(AssistProcessorTest_Driver);
   });
 }
 
 @reflectiveTest
 class AssistProcessorTest extends AbstractSingleUnitTest {
   int offset;
   int length;
 
   ServerPlugin plugin;
   Assist assist;
   SourceChange change;
   String resultCode;
   LinkedEditGroup linkedPositionGroup;
 
-  String flutterPkgLibPath = '/packages/flutter/lib';
-
-  String get _flutter_framework_code => '''
-class Widget {}
-class RenderObjectWidget extends Widget {}
-class StatelessWidget extends Widget {}
-class SingleChildRenderObjectWidget extends RenderObjectWidget {}
-class Transform extends SingleChildRenderObjectWidget {}
-class ClipRect extends SingleChildRenderObjectWidget { ClipRect.rect(){} }
-class AspectRatio extends SingleChildRenderObjectWidget {}
-class Container extends StatelessWidget { Container({child: null, width: null, height: null}){}}
-class Center extends StatelessWidget { Center({child: null, key: null}){}}
-class DefaultTextStyle extends StatelessWidget { DefaultTextStyle({child: null}){}}
-class Row extends Widget { Row({children: null}){}}
-class GestureDetector extends SingleChildRenderObjectWidget { GestureDetector({child: null, onTap: null}){}}
-class Scaffold extends Widget { Scaffold({body: null}){}}
-''';
-
   /**
    * Asserts that there is an [Assist] of the given [kind] at [offset] which
    * produces the [expected] code when applied to [testCode].
    */
   assertHasAssist(AssistKind kind, String expected) async {
     assist = await _assertHasAssist(kind);
     change = assist.change;
     // apply to "file"
     List<SourceFileEdit> fileEdits = change.edits;
     expect(fileEdits, hasLength(1));
@@ skipping 956 matching lines @@
   /// AAAAAAA [int] AAAAAAA
   /// BBBBBBBB BBBB BBBB
   /// CCC [A] CCCCCCCCCCC
   mmm() {}
 }
 ''');
   }
 
   test_convertFlutterChild_OK_multiLine() async {
     _configureFlutterPkg({
-      'src/widgets/framework.dart': _flutter_framework_code,
+      'src/widgets/framework.dart': flutter_framework_code,
     });
     await resolveTestUnit('''
 import 'package:flutter/src/widgets/framework.dart';
 build() {
   return new Scaffold(
 // start
     body: new Center(
       /*caret*/child: new Container(
         width: 200.0,
         height: 300.0,
@@ skipping 23 matching lines @@
     ),
 // end
   );
 }
 ''');
   }
 
   test_convertFlutterChild_OK_newlineChild() async {
     // This case could occur with deeply nested constructors, common in Flutter.
     _configureFlutterPkg({
-      'src/widgets/framework.dart': _flutter_framework_code,
+      'src/widgets/framework.dart': flutter_framework_code,
     });
     await resolveTestUnit('''
 import 'package:flutter/src/widgets/framework.dart';
 build() {
   return new Scaffold(
 // start
     body: new Center(
       /*caret*/child:
           new Container(
         width: 200.0,
@@ skipping 23 matching lines @@
       key: null,
     ),
 // end
   );
 }
 ''');
   }
 
   test_convertFlutterChild_OK_singleLine() async {
     _configureFlutterPkg({
-      'src/widgets/framework.dart': _flutter_framework_code,
+      'src/widgets/framework.dart': flutter_framework_code,
     });
     await resolveTestUnit('''
 import 'package:flutter/src/widgets/framework.dart';
 build() {
   return new Scaffold(
 // start
     body: new Center(
       /*caret*/child: new GestureDetector(),
       key: null,
     ),
@@ skipping 2480 matching lines @@
         DartAssistKind.JOIN_VARIABLE_DECLARATION,
         '''
 main() {
   var v = 1;
 }
 ''');
   }
 
   test_moveFlutterWidgetDown_OK() async {
     _configureFlutterPkg({
-      'src/widgets/framework.dart': _flutter_framework_code,
+      'src/widgets/framework.dart': flutter_framework_code,
     });
     await resolveTestUnit('''
 import 'package:flutter/src/widgets/framework.dart';
 build() {
   return new Scaffold(
 // start
     body: new /*caret*/GestureDetector(
       onTap: () => startResize(),
       child: new Center(
         child: new Container(
@@ skipping 28 matching lines @@
     ),
 // end
   );
 }
 startResize() {}
 ''');
   }
 
   test_moveFlutterWidgetUp_OK() async {
     _configureFlutterPkg({
-      'src/widgets/framework.dart': _flutter_framework_code,
+      'src/widgets/framework.dart': flutter_framework_code,
     });
     await resolveTestUnit('''
 import 'package:flutter/src/widgets/framework.dart';
 build() {
   return new Scaffold(
 // start
     body: new Center(
       child: new /*caret*/GestureDetector(
         onTap: () => startResize(),
         child: new Container(
@@ skipping 149 matching lines @@
     await assertHasAssistAt(
         'int ',
         DartAssistKind.REMOVE_TYPE_ANNOTATION,
         '''
 final V = 1;
 ''');
   }
 
   test_reparentFlutterList_BAD_multiLine() async {
     _configureFlutterPkg({
-      'src/widgets/framework.dart': _flutter_framework_code,
+      'src/widgets/framework.dart': flutter_framework_code,
     });
     await resolveTestUnit('''
 import 'package:flutter/src/widgets/framework.dart';
 build() {
   return new Container(
     child: new Row(
       children: [/*caret*/
 // start
         new Transform(),
         new Object(),
         new AspectRatio(),
 // end
       ],
     ),
   );
 }
 ''');
     _setCaretLocation();
     await assertNoAssist(DartAssistKind.REPARENT_FLUTTER_LIST);
   }
 
   test_reparentFlutterList_BAD_singleLine() async {
     _configureFlutterPkg({
-      'src/widgets/framework.dart': _flutter_framework_code,
+      'src/widgets/framework.dart': flutter_framework_code,
     });
     await resolveTestUnit('''
 import 'package:flutter/src/widgets/framework.dart';
 class FakeFlutter {
   main() {
   var obj;
 // start
     return new Row(children: [/*caret*/ new Transform()]);
 // end
   }
 }
 ''');
     _setCaretLocation();
     await assertNoAssist(DartAssistKind.REPARENT_FLUTTER_LIST);
   }
 
   test_reparentFlutterList_OK_multiLine() async {
     _configureFlutterPkg({
-      'src/widgets/framework.dart': _flutter_framework_code,
+      'src/widgets/framework.dart': flutter_framework_code,
     });
     await resolveTestUnit('''
 import 'package:flutter/src/widgets/framework.dart';
 build() {
   return new Container(
     child: new Row(
 // start
       children: [/*caret*/
         new Transform(),
         new Transform(),
@@ skipping 24 matching lines @@
       ],
 // end
     ),
   );
 }
 ''');
   }
 
   test_reparentFlutterWidget_BAD_minimal() async {
     _configureFlutterPkg({
-      'src/widgets/framework.dart': _flutter_framework_code,
+      'src/widgets/framework.dart': flutter_framework_code,
     });
     await resolveTestUnit('''
 /*caret*/x(){}
 ''');
     _setCaretLocation();
     await assertNoAssist(DartAssistKind.REPARENT_FLUTTER_WIDGET);
   }
 
   test_reparentFlutterWidget_BAD_singleLine() async {
     _configureFlutterPkg({
-      'src/widgets/framework.dart': _flutter_framework_code,
+      'src/widgets/framework.dart': flutter_framework_code,
     });
     await resolveTestUnit('''
 import 'package:flutter/src/widgets/framework.dart';
 class FakeFlutter {
   main() {
   var obj;
 // start
     return new Container(child: obj.xyz./*caret*/abc);
 // end
   }
 }
 ''');
     _setCaretLocation();
     await assertNoAssist(DartAssistKind.REPARENT_FLUTTER_WIDGET);
   }
 
   test_reparentFlutterWidget_OK_multiLines() async {
     _configureFlutterPkg({
-      'src/widgets/framework.dart': _flutter_framework_code,
+      'src/widgets/framework.dart': flutter_framework_code,
     });
     await resolveTestUnit('''
 import 'package:flutter/src/widgets/framework.dart';
 class FakeFlutter {
   main() {
     return new Container(
 // start
       child: new /*caret*/DefaultTextStyle(
         child: new Row(
           children: <Widget>[
@@ skipping 28 matching lines @@
       ),
 // end
     );
   }
 }
 ''');
   }
 
   test_reparentFlutterWidget_OK_singleLine1() async {
     _configureFlutterPkg({
-      'src/widgets/framework.dart': _flutter_framework_code,
+      'src/widgets/framework.dart': flutter_framework_code,
     });
     await resolveTestUnit('''
 import 'package:flutter/src/widgets/framework.dart';
 class FakeFlutter {
   main() {
 // start
     return /*caret*/new Container();
 // end
   }
 }
 ''');
     _setCaretLocation();
     await assertHasAssist(
         DartAssistKind.REPARENT_FLUTTER_WIDGET,
         '''
 import 'package:flutter/src/widgets/framework.dart';
 class FakeFlutter {
   main() {
 // start
     return /*caret*/new widget(child: new Container());
 // end
   }
 }
 ''');
   }
 
   test_reparentFlutterWidget_OK_singleLine2() async {
     _configureFlutterPkg({
-      'src/widgets/framework.dart': _flutter_framework_code,
+      'src/widgets/framework.dart': flutter_framework_code,
     });
     await resolveTestUnit('''
 import 'package:flutter/src/widgets/framework.dart';
 class FakeFlutter {
   main() {
 // start
     return new ClipRect./*caret*/rect();
 // end
   }
 }
@@ skipping 684 matching lines @@
 
   @override
   final AnalysisContext analysisContext;
 
   @override
   final CompilationUnit unit;
 
   _DartAssistContextForValues(this.source, this.selectionOffset,
       this.selectionLength, this.analysisContext, this.unit);
 }