Add quick-fix to convert child: to children:

pkg/analysis_server/test/services/correction/assist_test.dart

Index: pkg/analysis_server/test/services/correction/assist_test.dart
diff --git a/pkg/analysis_server/test/services/correction/assist_test.dart b/pkg/analysis_server/test/services/correction/assist_test.dart
index 29b3920b0722f86837bf626cb9847791e130b65a..1b86f3cdf0366af179a0ba4141aaee60446e711b 100644
--- a/pkg/analysis_server/test/services/correction/assist_test.dart
+++ b/pkg/analysis_server/test/services/correction/assist_test.dart
@@ -25,6 +25,7 @@ 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(() {
@@ -44,24 +45,6 @@ class AssistProcessorTest extends AbstractSingleUnitTest {
   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].
@@ -1038,7 +1021,7 @@ class A {
 
   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';
@@ -1082,7 +1065,7 @@ build() {
   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';
@@ -1126,7 +1109,7 @@ build() {
 
   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';
@@ -3627,7 +3610,7 @@ main() {
 
   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';
@@ -3676,7 +3659,7 @@ 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';
@@ -3846,7 +3829,7 @@ 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';
@@ -3870,7 +3853,7 @@ build() {
 
   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';
@@ -3889,7 +3872,7 @@ class FakeFlutter {
 
   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';
@@ -3934,7 +3917,7 @@ build() {
 
   test_reparentFlutterWidget_BAD_minimal() async {
     _configureFlutterPkg({
-      'src/widgets/framework.dart': _flutter_framework_code,
+      'src/widgets/framework.dart': flutter_framework_code,
     });
     await resolveTestUnit('''
 /*caret*/x(){}
@@ -3945,7 +3928,7 @@ build() {
 
   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';
@@ -3964,7 +3947,7 @@ class FakeFlutter {
 
   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';
@@ -4013,7 +3996,7 @@ class FakeFlutter {
 
   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';
@@ -4042,7 +4025,7 @@ class FakeFlutter {
 
   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';