.NET Core Integration tests fails because of HttpRequestException

Question

I am trying to test my API by calling an endpoint which should return an error message (json response). When testing this in Postman, the API indeed returns correct JSON and I am able to see that the status code is not 200. However, when trying to test this while using xunit and HttpClient, I am getting the following error message:

System.Net.Http.HttpRequestException : Error while copying content to a stream.

I am trying to figure out why this is happening. In my API I am checking credentials and if they are not correct, I will throw an Exception. This exception will get caught by a global exception handler, which will set the correct status code and create a json response.

Exception handler:

public class ExceptionHandler : IExceptionFilter
{
    public void OnException(ExceptionContext context)
    {
        int status = (int)HttpStatusCode.InternalServerError;
        String message = context.Exception.Message;
        var exception = context.Exception;

        if (exception is ArgumentNullException) 
        {
            message = ((ArgumentNullException)exception).ParamName + " is required";
            status = (int)HttpStatusCode.BadRequest;
        }

        if (exception is NotFoundException)
        {
            message = exception.Message;
            status = (int)HttpStatusCode.NotFound;
        }

        if (exception is AuthenticationException)
        {
            message = exception.Message;
            status = (int)HttpStatusCode.Unauthorized;
        }

        if (exception is DuplicateEntryException)
        {
            message = exception.Message;
            status = 422; // Unprocessable entity, not supported in HttpStatusCode class
        }

        HttpResponse response = context.HttpContext.Response;
        response.StatusCode = status;
        response.ContentType = "application/json";

        response.WriteAsync(JsonConvert.SerializeObject(new ErrorMessage(message, (int)status)));
    }
}

class ErrorMessage
{
    public string Message { get; set; }
    public int Code { get; set; }

    public ErrorMessage(string message, int code)
    {
        Message = message;
        Code = code;
    }
}

Integration test:

    [Fact]
    public async Task ItReturnsAnErrorWhenCredentialsAreIncorrect()
    {
        var request = new UserAuthenticationRequest();
        request.Username = "JohnDoe";
        request.Password = "TestPasswordIncorrect";

        var stringPayload = JsonConvert.SerializeObject(request);

        var httpContent = new StringContent(stringPayload, Encoding.UTF8, "application/json");

        _client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
        var response = await _client.PostAsync("api/authentication/GetUserAppToken", httpContent);


        Assert.Equal(401, (int)response.StatusCode);
    }

Anyone having any idea why it is throwing the HttpRequestException?

Update:

Client setup:

    public AuthenticationControllerTest()
    {
        _testServer = new TestServer(new WebHostBuilder().UseStartup());
        _client = _testServer.CreateClient();
    }

I did a test by setting up a new client per test method. Unfortunately that also didn't solve the problem

Update 2:

I think it has to do something with either the HttpClient setup or the request message I am sending. Instead of making use of the exception handler, I decided to return a BadRequest() from the controller right away.

    public BadRequestResult Post([FromBody]UserAuthenticationRequest userAuthenticationRequest)
    {
        return BadRequest();
    }

When doing that, I am getting a HttpRequestException again, instead of getting a HttpResponse with status code 400.

.NET Core Integration tests fails because of HttpRequestException

0 Answers