Quick fix to ignore a specific error (#25915).

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 fb2ee76a91fd828cd664a55bb6f1727cb60ce000..73cdfeb2df0bf5920a9299b4ac7ddb08533e2201 100644
--- a/pkg/analysis_server/test/edit/fixes_test.dart
+++ b/pkg/analysis_server/test/edit/fixes_test.dart
@@ -9,6 +9,7 @@ import 'dart:async';
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/domain_analysis.dart';
 import 'package:analysis_server/src/edit/edit_domain.dart';
+import 'package:analysis_server/src/services/correction/fix.dart';
 import 'package:plugin/manager.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 import 'package:unittest/unittest.dart' hide ERROR;
@@ -37,6 +38,7 @@ class FixesTest extends AbstractAnalysisTest {
     addTestFile('''
 main() {
   Future<String> x = null;
+  print(x);

[scheglov, 2016/03/04 18:55:20]

Why do we need this statement?

[pquitslund, 2016/03/04 19:09:39]

Without it, we get an `unused_local_variable` hint w/ an associated fix which
means errorFixes contains two fixes breaking the expect at line 46.  Seemed
easier to just not see this hint at all.

 }
 ''');
     await waitForTasksFinished();
@@ -46,9 +48,11 @@ main() {
     expect(error.severity, AnalysisErrorSeverity.WARNING);
     expect(error.type, AnalysisErrorType.STATIC_WARNING);
     List<SourceChange> fixes = errorFixes[0].fixes;
-    expect(fixes, hasLength(2));
+    expect(fixes, hasLength(3));
     expect(fixes[0].message, matches('Import library'));
     expect(fixes[1].message, matches('Create class'));
+    expect(
+        fixes[2].message, matches("Ignore error with code 'undefined_class'"));
   }
 
   test_hasFixes() async {