CODEWITHSUNDEEP
asp.net-mvcunit-testingasp.net-web-apinunitasp.net-web-api2
Divyang Desai
Divyang Desai

Reputation: 7866

Unit testing using Nunit gives an error

I just started with unit testing using Nunit with my WebApi project.

I've developed one test case for my controller:

private readonly INewsBusinessLogic _newsBusinessLogic;

[Test] 
public async Task GetAllNews()
{
   // Arrange
   var controller = new NewsController(_newsBusinessLogic);

   controller.Configuration = new System.Web.Http.HttpConfiguration();
   controller.Request = new System.Net.Http.HttpRequestMessage();

    // Act
    var actionResult = await controller.Get(); 

   //assert
   Assert.IsNotNull(actionResult);
}

Api controller:

public class NewsController : ApiController 
{  
    private readonly INewsBusinessLogic _newsBusinessLogic;

    public NewsController(INewsBusinessLogic newsBusinessLogic)
    {
        _newsBusinessLogic = newsBusinessLogic;
    }

    public async Task<IHttpActionResult> Get()
    {
       return Ok(await _newsBusinessLogic.GetNewsUpdates());
    }
}

When I debug my test it gives me an error of NullReferenceException on Act , well I know very well that What is a NullReferenceException?. But cannot figure it out, why this is occurred and how to solve it.

Side Note: I'm not using any ORM.

Upvotes: 1

Views: 120

Answers (1)

Nkosi
Nkosi

Reputation: 246998

well for one, you are passing in a null variable into NewsController constructor as you have not shown in your example where a value is assigned to _newsBusinessLogic

Here is an example using Moq of how to mock the controller's dependency

[Test] 
public async Task GetAllNews()
{
   // Arrange
   var newsBusinessLogicMock = new Mock<INewsBusinessLogic>();
   newsBusinessLogicMock
      .Setup(m => m.GetNewsUpdates())
      .ReturnsAsync("{your desired return here}");

   var controller = new NewsController(newsBusinessLogicMock.Object);

   controller.Configuration = new System.Web.Http.HttpConfiguration();
   controller.Request = new System.Net.Http.HttpRequestMessage();

    // Act
    var actionResult = await controller.Get(); 

   //assert
   Assert.IsNotNull(actionResult);
}

Upvotes: 2

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