Issue 21372. "Convert into block body" and "Convert into expression body" for factory constructors.

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 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/services/correction/assist.dart';
 import 'package:analysis_server/src/services/index/index.dart';
 import 'package:analysis_server/src/services/index/local_memory_index.dart';
@@ skipping 424 matching lines @@
     _indexTestUnit('''
 fff() {
   return 42;
 }
 ''');
     assertHasAssistAt('ff()', AssistKind.CONVERT_INTO_EXPRESSION_BODY, '''
 fff() => 42;
 ''');
   }
 
+  void test_convertToExpressionBody_OK_constructor() {
+    _indexTestUnit('''
+class A {
+  factory A() {
+    return null;
+  }
+}
+''');
+    assertHasAssistAt('A()', AssistKind.CONVERT_INTO_EXPRESSION_BODY, '''
+class A {
+  factory A() => null;
+}
+''');
+  }
+
+  void test_convertToBlockBody_OK_constructor() {
+    _indexTestUnit('''
+class A {
+  factory A() => null;
+}
+''');
+    assertHasAssistAt('A()', AssistKind.CONVERT_INTO_BLOCK_BODY, '''
+class A {
+  factory A() {
+    return null;
+  }
+}
+''');
+  }
+
   void test_convertToExpressionBody_OK_method_onBlock() {
     _indexTestUnit('''
 class A {
   m() { // marker
     return 42;
   }
 }
 ''');
     assertHasAssistAt(
         '{ // marker',
@@ skipping 1865 matching lines @@
   void _indexTestUnit(String code) {
     resolveTestUnit(code);
     index.indexUnit(context, testUnit);
   }
 
   void _setStartEndSelection() {
     offset = findOffset('// start\n') + '// start\n'.length;
     length = findOffset('// end') - offset;
   }
 }