Arrange async methods

[Vikas]

I am trying to test async method but i am getting null reference exception.

I have a service that has a GetAll method which is async: public async Task<IQueryable<T>> GetAll()

and the method under test is calling this method: await _service.GetAll();

I am mocking the service and then doing an arrange on the getAll method, but i get a null reference exception when the method is called in the code under test.

Mock.Arrange(() => mockService.GetAll()).Returns(Task.FromResult<IQueryable<Models.VM>>(vms.AsQueryable()));

 

Thanks

Vikas Mittal

[Stefan]

Hi Vikas,

I don't see anything out-of-place with your snippet. Can you give us a full repro project so that we can investigate the issue?

Regards,
Stefan
Telerik

[Vikas]

It is working now.

 

Thanks

vikas

[Larry]

Hi Vikas,

I got exactly the same issue with yours, do you mind to let me know how did you fix this issue?

 

Cheers,

Larry

[Vikas]

I think I had to make 2 changes, make the  unit test method async and use await to call the method under test.

[TestMethod]
        public async Task GetVirtualMachinesTest(){

// Act
            await ((Task)privViewModel.CallMethod("GetData", context));

     

}

[Kamen Ivanov]

Hi Larry,

Did you manage to fix the problem?

Regards,
Kamen Ivanov
Progress Telerik