Issue 27820. Add fix for CompileTimeErrorCode.UNDEFINED_CLASS.

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 3153 matching lines @@
         DartFixKind.IMPORT_LIBRARY_PROJECT1,
         '''
 import 'lib.dart';
 
 @Test(0)
 main() {
 }
 ''');
   }
 
+  test_importLibraryProject_withClass_constInstanceCreation() async {
+    addSource(
+        '/lib.dart',
+        '''
+class Test {
+  const Test();
+}
+''');
+    resolveTestUnit('''
+main() {
+  const Test();
+}
+''');
+    performAllAnalysisTasks();
+    await assertHasFix(
+        DartFixKind.IMPORT_LIBRARY_PROJECT1,
+        '''
+import 'lib.dart';
+
+main() {
+  const Test();
+}
+''');
+  }
+
   test_importLibraryProject_withClass_hasOtherLibraryWithPrefix() async {
     testFile = '/project/bin/test.dart';
     addSource(
         '/project/bin/a.dart',
         '''
 library a;
 class One {}
 ''');
     addSource(
         '/project/bin/b.dart',
@@ skipping 2294 matching lines @@
   var v = 42;
   print('v: $v');
 }
 ''');
   }
 
   void verifyResult(String expectedResult) {
     expect(resultCode, expectedResult);
   }
 }