Use HasToJson when set Reponse/Notification parameters.

pkg/analysis_server/test/protocol_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.protocol;
 
 import 'dart:convert';
 
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_testing/reflective_tests.dart';
 import 'package:unittest/unittest.dart';
+import 'package:analysis_server/src/collections.dart';
 
 
 Matcher _throwsRequestFailure = throwsA(new isInstanceOf<RequestFailure>());
 
 
 main() {
   groupSep = ' | ';
   group('Notification', () {
     runReflectiveTests(NotificationTest);
   });
@@ skipping 76 matching lines @@
 
   void test_getParameter_undefined() {
     Notification notification = new Notification('foo');
     expect(notification.event, equals('foo'));
     expect(notification.params.length, equals(0));
     expect(notification.getParameter('x'), isNull);
     expect(notification.toJson(), equals({
       'event': 'foo'
     }));
   }
+
+  void test_setParameter_HasToJson() {
+    Notification notification = new Notification('foo');
+    notification.setParameter('my', new _MyHasToJsonObject(42));
+    expect(notification.toJson(), equals({
+      'event': 'foo',
+      'params': {
+        'my': {
+          'offset': 42
+        }
+      }
+    }));
+  }
+
+  void test_setParameter_Iterable_HasToJson() {
+    Notification notification = new Notification('foo');
+    notification.setParameter('my', [
+      new _MyHasToJsonObject(1),
+      new _MyHasToJsonObject(2),
+      new _MyHasToJsonObject(3)]);
+    expect(notification.toJson(), equals({
+      'event': 'foo',
+      'params': {
+        'my': [{'offset': 1}, {'offset': 2}, {'offset': 3}]
+      }
+    }));
+  }
 }
 
 
+class _MyHasToJsonObject implements HasToJson {
+  int offset;
+  _MyHasToJsonObject(this.offset);
+  Map<String, Object> toJson() => {'offset': offset};
+}
+
+
 @ReflectiveTestCase()
 class RequestDatumTest {
   static Matcher isRequestDatum = new isInstanceOf<RequestDatum>(
       "RequestDatum");
 
   static Request request;
   static Matcher _throwsInvalidParameter = throwsA(
       new InvalidParameterResponseMatcher());
 
   void setUp() {
@@ skipping 548 matching lines @@
     response.setResult(resultName, resultValue);
     expect(response.getResult(resultName), same(resultValue));
     expect(response.toJson(), equals({
       Response.ID: '0',
       Response.RESULT: {
         resultName: resultValue
       }
     }));
   }
 }