public void CreateWithSingleJsonPostRequest_WriteTo_ResultIsAsExpected() { string boundary = "theBoundary"; string host = "http://www.ya.ru:9090/"; string query = "myquery"; var vm = new VmMock { Age = 42, Name = "Foo" }; var getRequest = HttpClientRequest.CreatePost(query).SetJsonContent(vm); var multipartContent = new MultipartContent(new[] { getRequest }, boundary); string parsed = GetContentString(host, multipartContent); string vmSerialized = JsonHelper.Serialize(vm); string expected = "--" + boundary + "\r\n" + "Content-Type: application/http; msgtype=request\r\n\r\n" + $"POST /{query} HTTP/1.1\r\n" + "Host: www.ya.ru:9090\r\n" + "Content-Type: application/json; charset=utf-8\r\n\r\n" + vmSerialized + "\r\n" + "--" + boundary + "--"; Assert.AreEqual(expected, parsed); }