Issue 26764. Insert required imports in the correct sorting order.

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 'dart:async';
 
 import 'package:analysis_server/plugin/edit/fix/fix_core.dart';
 import 'package:analysis_server/plugin/edit/fix/fix_dart.dart';
@@ skipping 690 matching lines @@
 ''');
     resolveTestUnit('''
 import 'libB.dart';
 main(B b) {
   b.foo();
 }
 ''');
     await assertHasFix(
         DartFixKind.CHANGE_TO_STATIC_ACCESS,
         '''
+import 'libA.dart';
 import 'libB.dart';
-import 'libA.dart';
 main(B b) {
   A.foo();
 }
 ''');
   }
 
   test_changeToStaticAccess_method_prefixLibrary() async {
     resolveTestUnit('''
 import 'dart:async' as pref;
 main(pref.Future f) {
@@ skipping 49 matching lines @@
 ''');
     resolveTestUnit('''
 import 'libB.dart';
 main(B b) {
   b.foo;
 }
 ''');
     await assertHasFix(
         DartFixKind.CHANGE_TO_STATIC_ACCESS,
         '''
+import 'libA.dart';
 import 'libB.dart';
-import 'libA.dart';
 main(B b) {
   A.foo;
 }
 ''');
   }
 
   test_changeTypeAnnotation_BAD_multipleVariables() async {
     resolveTestUnit('''
 main() {
   String a, b = 42;
@@ skipping 438 matching lines @@
 }
 ''');
     resolveTestUnit('''
 import 'libB.dart';
 class C extends B {
 }
 ''');
     await assertHasFix(
         DartFixKind.CREATE_CONSTRUCTOR_SUPER,
         '''
+import 'libA.dart';
 import 'libB.dart';
-import 'libA.dart';
 class C extends B {
   C(A a) : super(a);
 }
 ''');
   }
 
   test_createConstructorSuperImplicit_named() async {
     resolveTestUnit('''
 class A {
   A.named(p1, int p2);
@@ skipping 302 matching lines @@
 import 'libB.dart';
 class C {
 }
 main(C c) {
   c.test = getA();
 }
 ''');
     await assertHasFix(
         DartFixKind.CREATE_FIELD,
         '''
+import 'libA.dart';
 import 'libB.dart';
-import 'libA.dart';
 class C {
   A test;
 }
 main(C c) {
   c.test = getA();
 }
 ''');
   }
 
   test_createField_setter_generic_BAD() async {
@@ skipping 1217 matching lines @@
 ''');
     resolveTestUnit('''
 import 'libB.dart';
 main() {
   useFunction(test);
 }
 ''');
     await assertHasFix(
         DartFixKind.CREATE_FUNCTION,
         '''
+import 'libA.dart';
 import 'libB.dart';
-import 'libA.dart';
 main() {
   useFunction(test);
 }
 
 int test(A a) {
 }
 ''');
   }
 
   test_creationFunction_forFunctionType_method_enclosingClass_static() async {
@@ skipping 152 matching lines @@
     };
     resolveTestUnit('''
 library main;
 int main() async {
 }
 ''');
     await assertHasFix(
         DartFixKind.REPLACE_RETURN_TYPE_FUTURE,
         '''
 library main;
+
 import 'dart:async';
 Future<int> main() async {
 }
 ''');
   }
 
   test_illegalAsyncReturnType_asyncLibrary_usePrefix() async {
     errorFilter = (AnalysisError error) {
       return error.errorCode == StaticTypeWarningCode.ILLEGAL_ASYNC_RETURN_TYPE;
     };
@@ skipping 115 matching lines @@
 import 'b.dart' show Two;
 main () {
   new Two();
   new One();
 }
 ''');
     performAllAnalysisTasks();
     await assertHasFix(
         DartFixKind.IMPORT_LIBRARY_PROJECT,
         '''
+import 'a.dart';
 import 'b.dart' show Two;
-import 'a.dart';
 main () {
   new Two();
   new One();
 }
 ''');
   }
 
   test_importLibraryProject_withClass_inParentFolder() async {
     testFile = '/project/bin/test.dart';
     addSource(
@@ skipping 998 matching lines @@
 ''');
     resolveTestUnit('''
 import 'lib.dart';
 main() {
   test(getFuture());
 }
 ''');
     await assertHasFix(
         DartFixKind.CREATE_FUNCTION,
         '''
+import 'dart:async';
 import 'lib.dart';
-import 'dart:async';
 main() {
   test(getFuture());
 }
 
 void test(Future future) {
 }
 ''');
   }
 
   test_undefinedFunction_create_nullArgument() async {
@@ skipping 1183 matching lines @@
   @override
   void t() { }
 }
 ''');
   }
 
   void verifyResult(String expectedResult) {
     expect(resultCode, expectedResult);
   }
 }