Change integration test notifications to use structured objects.

pkg/analysis_server/test/integration/analysis/occurrences_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.occurrences;
 
 import 'package:analysis_server/src/protocol.dart';
 import 'package:unittest/unittest.dart';
 
 import '../../reflective_tests.dart';
@@ skipping 13 matching lines @@
     }
   }
   print(sum);
 }
 ''';
     writeFile(pathname, text);
     standardAnalysisSetup();
     sendAnalysisSetSubscriptions({
       AnalysisService.OCCURRENCES: [pathname]
     });
-    List occurrences;
-    onAnalysisOccurrences.listen((params) {
-      expect(params['file'], equals(pathname));
-      occurrences = params['occurrences'];
+    List<Occurrences> occurrences;
+    onAnalysisOccurrences.listen((AnalysisOccurrencesParams params) {
+      expect(params.file, equals(pathname));
+      occurrences = params.occurrences;
     });
     return analysisFinished.then((_) {
       expect(currentAnalysisErrors[pathname], isEmpty);
       Set<int> findOffsets(String elementName) {
-        for (Map occurrence in occurrences) {
-          if (occurrence['element']['name'] == elementName) {
-            return occurrence['offsets'].toSet();
+        for (Occurrences occurrence in occurrences) {
+          if (occurrence.element.name == elementName) {
+            return occurrence.offsets.toSet();
           }
         }
         fail('No element found matching $elementName');
         return null;
       }
       void check(String elementName, Iterable<String> expectedOccurrences) {
         Set<int> expectedOffsets = expectedOccurrences.map((String substring) =>
             text.indexOf(substring)).toSet();
         Set<int> foundOffsets = findOffsets(elementName);
         expect(foundOffsets, equals(expectedOffsets));
       }
       check('i', ['i = 0', 'i < 10', 'i++', 'i;']);
       check('j', ['j = 0', 'j < i', 'j++', 'j;']);
       check('sum', ['sum = 0', 'sum +=', 'sum)']);
     });
   }
 }
 
 main() {
   runReflectiveTests(Test);
 }