Support for searching LabelElements in SearchEngine.

pkg/analysis_server/test/services/search/search_engine_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.src.search.search_engine;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/services/index/index.dart';
 import 'package:analysis_server/src/services/index/local_memory_index.dart';
 import 'package:analysis_server/src/services/search/search_engine.dart';
 import 'package:analysis_server/src/services/search/search_engine_internal.dart';
-import '../../abstract_single_unit.dart';
-import '../../mocks.dart';
-import '../../reflective_tests.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:typed_mock/typed_mock.dart';
 import 'package:unittest/unittest.dart';
 
+import '../../abstract_single_unit.dart';
+import '../../mocks.dart';
+import '../../reflective_tests.dart';
+
 
 main() {
   groupSep = ' | ';
   runReflectiveTests(SearchEngineImplTest);
 }
 
 class ExpectedMatch {
   final Element element;
   final MatchKind kind;
   SourceRange range;
@@ skipping 380 matching lines @@
     LocalVariableElement element = findElement('v');
     Element mainElement = findElement('main');
     var expected = [
         _expectId(mainElement, MatchKind.WRITE, 'v = 1;'),
         _expectId(mainElement, MatchKind.READ_WRITE, 'v += 2;'),
         _expectId(mainElement, MatchKind.READ, 'v);'),
         _expectId(mainElement, MatchKind.INVOCATION, 'v();')];
     return _verifyReferences(element, expected);
   }
 
+  Future test_searchReferences_LabelElement() {
+    _indexTestUnit('''
+main() {
+label:
+  while (true) {
+    if (true) {
+      break label; // 1
+    }
+    break label; // 2
+  }
+}
+''');
+    LabelElement element = findElement('label');
+    Element mainElement = findElement('main');
+    var expected = [
+        _expectId(mainElement, MatchKind.REFERENCE, 'label; // 1'),
+        _expectId(mainElement, MatchKind.REFERENCE, 'label; // 2')];
+    return _verifyReferences(element, expected);
+  }
+
   Future test_searchReferences_MethodElement() {
     _indexTestUnit('''
 class A {
   m() {}
   main() {
     m(); // 1
     this.m(); // 2
     print(m); // 3
     print(this.m); // 4
   }
@@ skipping 225 matching lines @@
         pattern).then((List<SearchMatch> matches) {
       _assertMatches(matches, expectedMatches);
     });
   }
 
   static void _assertMatches(List<SearchMatch> matches,
       List<ExpectedMatch> expectedMatches) {
     expect(matches, unorderedEquals(expectedMatches));
   }
 }