public async void SendPostRequestAndReturnOkWhenAddTodoAsync()
{
// Arrange
_mockHandler.Protected()
.Setup <Task <HttpResponseMessage> >("SendAsync",
ItExpr.IsAny <HttpRequestMessage>(),
ItExpr.IsAny <CancellationToken>())
.ReturnsAsync(new HttpResponseMessage(HttpStatusCode.OK));
var client = new HttpClient(_mockHandler.Object);
client.BaseAddress = new Uri("https://localhost:44376");
_mockClientFactory.Setup(x => x.CreateClient("TodoAppClient")).Returns(client);
var sut = new TodoItemService(_mockClientFactory.Object);
// Act
var result = await sut.AddTodoAsync(It.IsAny <TodoItemForCreationDto>());
// Assert
_mockHandler.Protected().Verify(
"SendAsync",
Times.Exactly(1),
ItExpr.Is <HttpRequestMessage>(req => req.Method == HttpMethod.Post),
ItExpr.IsAny <CancellationToken>());
Assert.Equal(HttpStatusCode.OK, result.StatusCode);
}