Issue 26335. Insert an empty line if the class body is a single line.

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 1029 matching lines @@
 
   method() {}
 }
 main() {
   new A.named(1, 2.0);
 }
 ''');
     _assertLinkedGroup(change.linkedEditGroups[0], ['named(int ', 'named(1']);
   }
 
+  test_createConstructor_named_emptyClassBody() async {
+    resolveTestUnit('''
+class A {}
+main() {
+  new A.named(1);
+}
+''');
+    await assertHasFix(
+        DartFixKind.CREATE_CONSTRUCTOR,
+        '''
+class A {
+  A.named(int i) {

[Brian Wilkerson, 2016/08/16 21:58:17]

If it has an empty body, should we just produce a ";"? (I'm not sure, so I'll
trust your choice.)

[scheglov, 2016/08/16 22:13:06]

Good idea.
Thank you.
Fixed.

+  }
+}
+main() {
+  new A.named(1);
+}
+''');
+    _assertLinkedGroup(change.linkedEditGroups[0], ['named(int ', 'named(1']);
+  }
+
   test_createConstructorForFinalFields_inTopLevelMethod() async {
     resolveTestUnit('''
 main() {
   final int v;
 }
 ''');
     await assertNoFix(DartFixKind.CREATE_CONSTRUCTOR_FOR_FINAL_FIELDS);
   }
 
   test_createConstructorForFinalFields_topLevelField() async {
@@ skipping 1502 matching lines @@
       String endString = expectedCode.substring(endOffset, endOffset + 25);
       expect(endString, contains('m1'));
       expect(endString, isNot(contains('m2')));
       expect(endString, isNot(contains('m3')));
       expect(endString, isNot(contains('m4')));
       expect(endString, isNot(contains('m5')));
       expect(endString, isNot(contains('m6')));
     }
   }
 
+  test_createMissingOverrides_method_emptyClassBody() async {
+    resolveTestUnit('''
+abstract class A {
+  void foo();
+}
+
+class B extends A {}
+''');
+    await assertHasFix(
+        DartFixKind.CREATE_MISSING_OVERRIDES,
+        '''
+abstract class A {
+  void foo();
+}
+
+class B extends A {
+  @override
+  void foo() {
+    // TODO: implement foo
+  }
+}
+''');
+  }
+
   test_createMissingOverrides_operator() async {
     resolveTestUnit('''
 abstract class A {
   int operator [](int index);
   void operator []=(int index, String value);
 }
 
 class B extends A {
 }
 ''');
@@ skipping 2750 matching lines @@
   @override
   void t() { }
 }
 ''');
   }
 
   void verifyResult(String expectedResult) {
     expect(resultCode, expectedResult);
   }
 }