Added some cache tests

Author: seifibrahim32

pkgs/http/test/html/cache_test.dart

@@ -0,0 +1,70 @@
+// 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.
+
+@TestOn('browser')
+library;
+
+import 'dart:async';
+import 'dart:convert';
+
+import 'package:http/browser_client.dart';
+import 'package:http/http.dart' as http;
+import 'package:test/test.dart';
+
+import 'utils.dart';
+
+void main() {
+
+  test('#send a StreamedRequest with default type', () async {
+    var client = BrowserClient(cacheMode: CacheMode.defaultType);
+    var request = http.StreamedRequest('POST',echoUrl);
+
+    var responseFuture = client.send(request);
+    request.sink.add('{"hello": "world"}'.codeUnits);
+    unawaited(request.sink.close());
+    var response = await responseFuture;
+    var bytesString = await response.stream.bytesToString();
+
+    final jsonResponse = jsonDecode(bytesString);
+    var bodyUnits = jsonResponse['body'] as List;
+    client.close();
+
+    expect(bodyUnits,
+        equals('{"hello": "world"}'.codeUnits));
+  });
+
+  test('#send a StreamedRequest with reload type', () async {
+    var client = BrowserClient(cacheMode: CacheMode.reload);
+    var request = http.StreamedRequest('POST',echoUrl);
+
+    var responseFuture = client.send(request);
+    request.sink.add('{"hello": "world"}'.codeUnits);
+    unawaited(request.sink.close());
+    var response = await responseFuture;
+    var bytesString = await response.stream.bytesToString();
+
+    final jsonResponse = jsonDecode(bytesString);
+    client.close();
+
+    expect(jsonResponse["headers"]["cache-control"],
+        contains('no-cache'));
+  });
+
+  test('#send a StreamedRequest with no-cache type', () async {
+    var client = BrowserClient(cacheMode: CacheMode.noCache);
+    var request = http.StreamedRequest('POST',echoUrl);
+
+    var responseFuture = client.send(request);
+    request.sink.add('{"hello": "world"}'.codeUnits);
+    unawaited(request.sink.close());
+    var response = await responseFuture;
+    var bytesString = await response.stream.bytesToString();
+
+    final jsonResponse = jsonDecode(bytesString);
+    client.close();
+
+    expect(jsonResponse["headers"]["cache-control"],
+        contains('max-age=0'));
+  });
+}