More tweaks in attempt to debug the reason of failing getNavigation() tests.

pkg/analysis_server/test/analysis/get_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.get_navigation;
 
 import 'package:analysis_server/src/domain_analysis.dart';
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
@@ skipping 12 matching lines @@
   static const String requestId = 'test-getNavigtion';
 
   @override
   void setUp() {
     super.setUp();
     server.handlers = [new AnalysisDomainHandler(server),];
     createProject();
   }
 
   test_beforeAnalysisComplete() async {
+    print('+++test_beforeAnalysisComplete');
     addTestFile('''
 main() {
   var test = 0;
   print(test);
 }
 ''');
     await _getNavigation(testFile, testCode.indexOf('test);'), 0);
     assertHasRegion('test);');
     assertHasTarget('test = 0');
   }
 
   test_fileDoesNotExist() {
+    print('+++test_fileDoesNotExist');
     String file = '$projectPath/doesNotExist.dart';
     return _checkInvalid(file, -1, -1);
   }
 
   test_fileWithoutContext() {
+    print('+++test_fileWithoutContext');
     String file = '/outside.dart';
     addFile(
         file,
         '''
 main() {
   print(42);
 }
 ''');
     return _checkInvalid(file, -1, -1);
   }
 
   test_multipleRegions() async {
+    print('+++test_multipleRegions');
     addTestFile('''
 main() {
   var aaa = 1;
   var bbb = 2;
   var ccc = 3;
   var ddd = 4;
   print(aaa + bbb + ccc + ddd);
 }
 ''');
     await waitForTasksFinished();
@@ skipping 10 matching lines @@
       assertHasTarget('bbb = 2');
     }
     {
       assertHasRegion('ccc +');
       assertHasTarget('ccc = 3');
     }
     assertNoRegionAt('ddd)');
   }
 
   test_removeContextAfterRequest() async {
+    print('+++test_removeContextAfterRequest');
     addTestFile('''
 main() {
   var test = 0;
   print(test);
 }
 ''');
     // handle the request synchronously
     Request request =
         _createGetNavigationRequest(testFile, testCode.indexOf('test);'), 0);
     server.handleRequest(request);
     // remove context, causes sending an "invalid file" error
     {
       Folder projectFolder = resourceProvider.getResource(projectPath);
       server.contextManager.callbacks.removeContext(projectFolder, <String>[]);
     }
     // wait for an error response
     Response response = await serverChannel.waitForResponse(request);
     expect(response.error, isNotNull);
     expect(response.error.code, RequestErrorCode.GET_NAVIGATION_INVALID_FILE);
   }
 
   test_zeroLength_end() async {
+    print('+++test_zeroLength_end');
     addTestFile('''
 main() {
   var test = 0;
   print(test);
 }
 ''');
     await waitForTasksFinished();
     await _getNavigation(testFile, testCode.indexOf(');'), 0);
     assertHasRegion('test);');
     assertHasTarget('test = 0');
   }
 
   test_zeroLength_start() async {
+    print('+++test_zeroLength_start');
     addTestFile('''
 main() {
   var test = 0;
   print(test);
 }
 ''');
     await waitForTasksFinished();
     await _getNavigation(testFile, testCode.indexOf('test);'), 0);
     assertHasRegion('test);');
     assertHasTarget('test = 0');
@@ skipping 14 matching lines @@
   _getNavigation(String file, int offset, int length) async {
     Request request = _createGetNavigationRequest(file, offset, length);
     Response response = await serverChannel.sendRequest(request);
     AnalysisGetNavigationResult result =
         new AnalysisGetNavigationResult.fromResponse(response);
     targetFiles = result.files;
     targets = result.targets;
     regions = result.regions;
   }
 }