issue 17992 Added extra params to message

pkg/shelf/test/request_test.dart

Index: pkg/shelf/test/request_test.dart
diff --git a/pkg/shelf/test/request_test.dart b/pkg/shelf/test/request_test.dart
index ce592c7c28a85eeaec4f5d1be66abb2c456e16c2..e4c2c4ba6f13b7d61bbc6f96ca6d8bb9717b923c 100644
--- a/pkg/shelf/test/request_test.dart
+++ b/pkg/shelf/test/request_test.dart
@@ -10,10 +10,11 @@ import 'dart:convert';
 import 'package:shelf/shelf.dart';
 import 'package:unittest/unittest.dart';
 
-Request _request([Map<String, String> headers, Stream<List<int>> body]) {
+Request _request([Map<String, String> headers, Stream<List<int>> body,
+                  Map<String, Object> context]) {
   if (headers == null) headers = {};
   return new Request("/", "", "GET", "", "1.1", Uri.parse('http://localhost/'),
-      headers, body: body);
+      headers, body: body, context: context);
 }
 
 void main() {
@@ -147,4 +148,14 @@ void main() {
       }).encoding, equals(LATIN1));
     });
   });
+  
+  group("context", () {
+    test("are correctly populated", () {
+      expect(_request({
+        'content-type': 'text/plain'
+      }, null, {
+        'my-param' : 42
+      }).context['my-param'], equals(42));
+    });
+  });
 }