public void SendAsyncTest()
        {
            var content = "Hello World";
            var factory = new Mock <IHttpClientFactory>();
            var handler = new Mock <HttpMessageHandler>(MockBehavior.Strict);

            handler
            .Protected()
            .Setup <Task <HttpResponseMessage> >(
                "SendAsync",
                ItExpr.IsAny <HttpRequestMessage>(),
                ItExpr.IsAny <CancellationToken>()
                )
            .ReturnsAsync(new HttpResponseMessage
            {
                StatusCode = HttpStatusCode.OK,
                Content    = new StringContent(content),
            })
            .Verifiable();

            var client = new HttpClient(handler.Object);

            factory.Setup(httpFactory => httpFactory.CreateClient(It.IsAny <string>())).Returns(client);

            var httpService = new HttpServices(factory.Object);

            var httpRequestMessage = new HttpRequestMessage(HttpMethod.Get, "http://test.com/api/test/whatever");
            var result             = httpService.SendAsync(httpRequestMessage);

            result.Should().NotBeNull();

            var actualResult = result.Result;

            actualResult.StatusCode.Should().Be(HttpStatusCode.OK);
            actualResult.Content.ReadAsStringAsync().Result.Should().Be(content);
        }