Add ServerOperation and queue.

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 244 matching lines @@
 
   /**
    * Returns highlights recorded for the given [testFile].
    * May be empty, but not `null`.
    */
   List<Map<String, Object>> getTestHighlights() {
     return getHighlights(testFile);
   }
 
   /**
-   * Creates an empty project `/project/`.
+   * Creates an empty project `/project`.
    */
   void createEmptyProject() {
     resourceProvider.newFolder('/project');
     Request request = new Request('0', METHOD_SET_ANALYSIS_ROOTS);
     request.setParameter(INCLUDED, ['/project']);
     request.setParameter(EXCLUDED, []);
     handleSuccessfulRequest(request);
   }
 
   /**
@@ skipping 821 matching lines @@
         Request request = new Request('0', METHOD_UPDATE_CONTENT);
         request.setParameter('files',
             {
               helper.testFile : {
                 CONTENT : 'library lib'
               }
             });
         helper.handleSuccessfulRequest(request);
       }
       // wait, there is an error
-      helper.waitForTasksFinished().then((_) {
+      return helper.waitForTasksFinished().then((_) {
         List<AnalysisError> errors = helper.getTestErrors();
         expect(errors, hasLength(1));
       });
     });
   });
 
   test('incremental', () {
     AnalysisTestHelper helper = new AnalysisTestHelper();
     helper.createSingleFileProject('library A;');
     return helper.waitForTasksFinished().then((_) {
       // no errors initially
       List<AnalysisError> errors = helper.getTestErrors();
       expect(errors, isEmpty);
       // update code
       {
         Request request = new Request('0', METHOD_UPDATE_CONTENT);
         request.setParameter('files',
             {
               helper.testFile : {
                 CONTENT : 'library lib',
                 OFFSET : 'library '.length,
                 OLD_LENGTH : 'A;'.length,
                 NEW_LENGTH : 'lib'.length,
               }
             });
         helper.handleSuccessfulRequest(request);
       }
       // wait, there is an error
-      helper.waitForTasksFinished().then((_) {
+      return helper.waitForTasksFinished().then((_) {
         List<AnalysisError> errors = helper.getTestErrors();
         expect(errors, hasLength(1));
       });
     });
   });
 }
 
 
 void test_setSubscriptions() {
   test('before analysis', () {
@@ skipping 20 matching lines @@
       // subscribe
       helper.addAnalysisSubscriptionHighlight(helper.testFile);
       // wait, has regions
       return helper.waitForTasksFinished().then((_) {
         var highlights = helper.getHighlights(helper.testFile);
         expect(highlights, isNot(isEmpty));
       });
     });
   });
 }