Issue 24599. Fix for requesting navigation for directives.

pkg/analysis_server/test/analysis/notification_navigation_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.analysis.notification.navigation;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/constants.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 import 'package:unittest/unittest.dart';
 
 import '../analysis_abstract.dart';
 import '../utils.dart';
 
 main() {
   initializeTestEnvironment();
   defineReflectiveTests(AnalysisNotificationNavigationTest);
 }
 
 class AbstractNavigationTest extends AbstractAnalysisTest {
   List<NavigationRegion> regions;
   List<NavigationTarget> targets;
   List<String> targetFiles;
 
   NavigationRegion testRegion;
   List<int> testTargetIndexes;
+  List<NavigationTarget> testTargets;
   NavigationTarget testTarget;
 
   /**
    * Validates that there is a target in [testTargetIndexes] with [file],
    * at [offset] and with the given [length].
    */
   void assertHasFileTarget(String file, int offset, int length) {
-    List<NavigationTarget> testTargets =
-        testTargetIndexes.map((int index) => targets[index]).toList();
     for (NavigationTarget target in testTargets) {
       if (targetFiles[target.fileIndex] == file &&
           target.offset == offset &&
           target.length == length) {
         testTarget = target;
         return;
       }
     }
     fail(
         'Expected to find target (file=$file; offset=$offset; length=$length) in\n'
@@ skipping 112 matching lines @@
   void findRegion(int offset, int length, bool exists) {
     for (NavigationRegion region in regions) {
       if (region.offset == offset &&
           (length == -1 || region.length == length)) {
         if (exists == false) {
           fail('Not expected to find (offset=$offset; length=$length) in\n'
               '${regions.join('\n')}');
         }
         testRegion = region;
         testTargetIndexes = region.targets;
+        testTargets = testTargetIndexes.map((i) => targets[i]).toList();
         return;
       }
     }
     if (exists == true) {
       fail('Expected to find (offset=$offset; length=$length) in\n'
           '${regions.join('\n')}');
     }
   }
 }
 
@@ skipping 744 matching lines @@
   test_type_void() {
     addTestFile('''
 void main() {
 }
 ''');
     return prepareNavigation().then((_) {
       assertNoRegionAt('void');
     });
   }
 }