Unit Testing .Net CORE 2.0 WebAPI - Mock (MOQ) HTTP POST with text stream body (not model)

Question

I am trying to unit test my HTTP POST method of my .Net CORE 2.0 API Controller which stream-reads data... Cannot use a "model" type approach as the incoming stream raw data.

Here is the basics of the controller method.

[HttpPost()]
[Authorize(Roles = "contributor")]
public async Task<IActionResult> SubmitReport()
{
    IActionResult result = null;
    _logger.LogInformation("POST Request");

    var buffer = new byte[this.Request.ContentLength.Value];

    await this.Request.Body.ReadAsync(buffer, 0, buffer.Length);
    string content = System.Text.Encoding.UTF8.GetString(buffer);

    // Do something with the 'content'

    return (Accepted());  // Assuming all was OK
}

And here's my Unit Test... or rather as far as I can get..

[TestMethod]
public void eFormController_SubmitReport_MockService_ExpectHttpStatusAccepted()
{
    var mockContextAccessor = new Mock<IHttpContextAccessor>();
    var context = new DefaultHttpContext();
    mockContextAccessor.Setup(x => x.HttpContext).Returns(context);

    var mockLogger = new Mock<ILogger<object>>();
    var ctrl = new Controllers.eFormsController();

    var result = ctrl.SubmitReport();

    Assert.IsInstanceOfType(result, typeof(Microsoft.AspNetCore.Mvc.AcceptedResult));
}

When I run the test as it stands, the this.Request property is null so how do I Mock a proper HTTP POST request.

Google has yet to yield any favourable results as they all assume a fully defined model, and not a text stream

Answer 1

You have already done most of the work by using the DefaultHttpContext.

Arrange a request that has a body (stream) and the necessary properties to allow the method under test to flow as expected.

Should be able to exercise the test from there

[TestMethod]
public async Task eFormController_SubmitReport_MockService_ExpectHttpStatusAccepted() {
    //Arrange
    var data = "Hello World!!";
    var stream = new MemoryStream(System.Text.Encoding.UTF8.GetBytes(data));

    var httpContext = new DefaultHttpContext();
    httpContext.Request.Body = stream;
    httpContext.Request.ContentLength = stream.Length;

    var mockLogger = new Mock<ILogger<object>>();

    var controllerContext = new ControllerContext() {
        HttpContext = httpContext,
    };

    var controller = new Controllers.eFormsController(mockLogger.Object) {
         ControllerContext = controllerContext,
    };

    //Act
    var result = await controller.SubmitReport();

    //Assert
    Assert.IsInstanceOfType(result, typeof(Microsoft.AspNetCore.Mvc.AcceptedResult));
}