Issue 23477. Fix for Quick Fixes in overlay-only files.

pkg/analysis_server/test/edit/fixes_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.edit.fixes;
 
 import 'dart:async';
 
+import 'package:analysis_server/src/domain_analysis.dart';
 import 'package:analysis_server/src/edit/edit_domain.dart';
 import 'package:analysis_server/src/plugin/server_plugin.dart';
 import 'package:analysis_server/src/protocol.dart';
 import 'package:plugin/manager.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 import 'package:unittest/unittest.dart' hide ERROR;
 
 import '../analysis_abstract.dart';
+import '../mocks.dart';
 
 main() {
   groupSep = ' | ';
   defineReflectiveTests(FixesTest);
 }
 
 @reflectiveTest
 class FixesTest extends AbstractAnalysisTest {
   @override
   void setUp() {
@@ skipping 43 matching lines @@
       // print(10)
       {
         List<AnalysisErrorFixes> errorFixes = _getFixesAt('print(10)');
         expect(errorFixes, hasLength(2));
         _isSyntacticErrorWithSingleFix(errorFixes[0]);
         _isSyntacticErrorWithSingleFix(errorFixes[1]);
       }
     });
   }
 
+  Future test_overlayOnlyFile() {
+    // add an overlay-only file
+    {
+      testCode = '''
+main() {
+  print(1)
+}
+''';
+      Request request = new AnalysisUpdateContentParams(
+          {testFile: new AddContentOverlay(testCode)}).toRequest('0');
+      Response response =
+          new AnalysisDomainHandler(server).handleRequest(request);
+      expect(response, isResponseSuccess('0'));
+    }
+    // ask for fixes
+    return waitForTasksFinished().then((_) {
+      List<AnalysisErrorFixes> errorFixes = _getFixesAt('print(1)');
+      expect(errorFixes, hasLength(1));
+      _isSyntacticErrorWithSingleFix(errorFixes[0]);
+    });
+  }
+
   List<AnalysisErrorFixes> _getFixes(int offset) {
     Request request = new EditGetFixesParams(testFile, offset).toRequest('0');
     Response response = handleSuccessfulRequest(request);
     var result = new EditGetFixesResult.fromResponse(response);
     return result.fixes;
   }
 
   List<AnalysisErrorFixes> _getFixesAt(String search) {
     int offset = findOffset(search);
     return _getFixes(offset);
   }
 
   void _isSyntacticErrorWithSingleFix(AnalysisErrorFixes fixes) {
     AnalysisError error = fixes.error;
     expect(error.severity, AnalysisErrorSeverity.ERROR);
     expect(error.type, AnalysisErrorType.SYNTACTIC_ERROR);
     expect(fixes.fixes, hasLength(1));
   }
 }