Change integration test notifications to use structured objects.

pkg/analysis_server/test/integration/analysis/error_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.integration.analysis.error;
 
-import '../../reflective_tests.dart';
+import 'package:analysis_server/src/protocol.dart';
 import 'package:unittest/unittest.dart';
 
+import '../../reflective_tests.dart';
 import '../integration_tests.dart';
-import '../protocol_matchers.dart';
 
 @ReflectiveTestCase()
 class AnalysisErrorIntegrationTest extends AbstractAnalysisServerIntegrationTest
     {
   test_detect_simple_error() {
     String pathname = sourcePath('test.dart');
     writeFile(pathname,
         '''
 main() {
   var x // parse error: missing ';'
 }''');
     standardAnalysisSetup();
     return analysisFinished.then((_) {
       expect(currentAnalysisErrors[pathname], isList);
-      List errors = currentAnalysisErrors[pathname];
+      List<AnalysisError> errors = currentAnalysisErrors[pathname];
       expect(errors, hasLength(1));
-      expect(errors[0], isAnalysisError);
-      expect(errors[0]['location']['file'], equals(pathname));
+      expect(errors[0].location.file, equals(pathname));
     });
   }
 }
 
 main() {
   runReflectiveTests(AnalysisErrorIntegrationTest);
 }