Upgrade unittest to be able to use isNotEmpty.

pkg/analysis_server/test/domain_analysis_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.domain.analysis;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/constants.dart';
@@ skipping 161 matching lines @@
 void test_setSubscriptions() {
   test('before analysis', () {
     AnalysisTestHelper helper = new AnalysisTestHelper();
     // subscribe
     helper.addAnalysisSubscriptionHighlights(helper.testFile);
     // create project
     helper.createSingleFileProject('int V = 42;');
     // wait, there are highlight regions
     helper.waitForOperationsFinished().then((_) {
       var highlights = helper.getHighlights(helper.testFile);
-      expect(highlights, isNot(isEmpty));
+      expect(highlights, isNotEmpty);
     });
   });
 
   test('after analysis', () {
     AnalysisTestHelper helper = new AnalysisTestHelper();
     // create project
     helper.createSingleFileProject('int V = 42;');
     // wait, no regions initially
     return helper.waitForOperationsFinished().then((_) {
       var highlights = helper.getHighlights(helper.testFile);
       expect(highlights, isEmpty);
       // subscribe
       helper.addAnalysisSubscriptionHighlights(helper.testFile);
       // wait, has regions
       return helper.waitForOperationsFinished().then((_) {
         var highlights = helper.getHighlights(helper.testFile);
-        expect(highlights, isNot(isEmpty));
+        expect(highlights, isNotEmpty);
       });
     });
   });
 
   test('after analysis, no such file', () {
     AnalysisTestHelper helper = new AnalysisTestHelper();
     helper.createSingleFileProject('int V = 42;');
     return helper.waitForOperationsFinished().then((_) {
       String noFile = '/no-such-file.dart';
       helper.addAnalysisSubscriptionHighlights(noFile);
       return helper.waitForOperationsFinished().then((_) {
         var highlights = helper.getHighlights(noFile);
         expect(highlights, isEmpty);
       });
     });
   });
 
   test('after analysis, SDK file', () {
     AnalysisTestHelper helper = new AnalysisTestHelper();
     helper.createSingleFileProject('''
 main() {
   print(42);
 }
 ''');
     return helper.waitForOperationsFinished().then((_) {
       String file = '/lib/core/core.dart';
       helper.addAnalysisSubscriptionNavigation(file);
       return helper.waitForOperationsFinished().then((_) {
         var navigationRegions = helper.getNavigation(file);
-        expect(navigationRegions, isNot(isEmpty));
+        expect(navigationRegions, isNotEmpty);
       });
     });
   });
 }
 
 
 testUpdateContent() {
   test('bad type', () {
     AnalysisTestHelper helper = new AnalysisTestHelper();
     helper.createSingleFileProject('// empty');
@@ skipping 149 matching lines @@
 import 'package:pkgA/libA.dart';
 f(A a) {
 }
 ''');
     String pkgDependency = posix.join(projectPath, 'package_dep');
     resourceProvider.newFile(pkgDependency, 'contents');
     packageMapProvider.dependencies.add(pkgDependency);
     // Create project and wait for analysis
     createProject();
     return waitForTasksFinished().then((_) {
-      expect(filesErrors[testFile], isNot(isEmpty));
+      expect(filesErrors[testFile], isNotEmpty);
       // Add the package to the package map and tickle the package dependency.
       packageMapProvider.packageMap = {
         'pkgA': [resourceProvider.getResource('/packages/pkgA')]
       };
       resourceProvider.modifyFile(pkgDependency, 'new contents');
       // Let the server time to notice the file has changed, then let
       // analysis omplete.  There should now be no error.
       return pumpEventQueue().then((_) => waitForTasksFinished()).then((_) {
         expect(filesErrors[testFile], isEmpty);
       });
@@ skipping 230 matching lines @@
     return waitForServerOperationsPerformed(server);
   }
 
   static String _getCodeString(code) {
     if (code is List<String>) {
       code = code.join('\n');
     }
     return code as String;
   }
 }