Make subclasses of AbstractContextTest asynchronous.

pkg/analysis_server/test/services/refactoring/convert_getter_to_method_test.dart

Index: pkg/analysis_server/test/services/refactoring/convert_getter_to_method_test.dart
diff --git a/pkg/analysis_server/test/services/refactoring/convert_getter_to_method_test.dart b/pkg/analysis_server/test/services/refactoring/convert_getter_to_method_test.dart
index 9b74f44ac938583b0edea8b9e1a1fc20f3b87454..859f1eba4d45623e2b236730a05a75ed33631bb5 100644
--- a/pkg/analysis_server/test/services/refactoring/convert_getter_to_method_test.dart
+++ b/pkg/analysis_server/test/services/refactoring/convert_getter_to_method_test.dart
@@ -24,8 +24,8 @@ main() {
 class ConvertGetterToMethodTest extends RefactoringTest {
   ConvertGetterToMethodRefactoring refactoring;
 
-  test_change_function() {
-    indexTestUnit('''
+  test_change_function() async {
+    await indexTestUnit('''
 int get test => 42;
 main() {
   var a = test;
@@ -43,8 +43,8 @@ main() {
 ''');
   }
 
-  test_change_method() {
-    indexTestUnit('''
+  test_change_method() async {
+    await indexTestUnit('''
 class A {
   int get test => 1;
 }
@@ -88,15 +88,15 @@ main(A a, B b, C c, D d) {
 ''');
   }
 
-  test_change_multipleFiles() {
-    indexUnit(
+  test_change_multipleFiles() async {
+    await indexUnit(
         '/other.dart',
         r'''
 class A {
   int get test => 1;
 }
 ''');
-    indexTestUnit('''
+    await indexTestUnit('''
 import 'other.dart';
 class B extends A {
   int get test => 2;
@@ -120,8 +120,8 @@ main(A a, B b) {
 ''');
   }
 
-  test_checkInitialConditions_syntheticGetter() {
-    indexTestUnit('''
+  test_checkInitialConditions_syntheticGetter() async {
+    await indexTestUnit('''
 int test = 42;
 main() {
 }