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

pkg/analysis_server/test/edit/fixes_test.dart

Index: pkg/analysis_server/test/edit/fixes_test.dart
diff --git a/pkg/analysis_server/test/edit/fixes_test.dart b/pkg/analysis_server/test/edit/fixes_test.dart
index 7da3e75332937205a2198b98ee3b192bdde90033..396c547a2691a6034dfe8f24e896b74981b55efb 100644
--- a/pkg/analysis_server/test/edit/fixes_test.dart
+++ b/pkg/analysis_server/test/edit/fixes_test.dart
@@ -6,6 +6,7 @@ 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';
@@ -14,6 +15,7 @@ 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 = ' | ';
@@ -77,6 +79,28 @@ bar() {
     });
   }
 
+  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);