public async Task GetCurrentPaymentMethod_ActivePaymentMethodDoesNotExist_NullReturned()
{
//Arrange
var fakeMediator = Substitute.For <IMediator>();
fakeMediator
.Send(Arg.Any <GetActivePaymentMethodForUserQuery>())
.Returns((PaymentMethod)null);
var mapper = AutoMapperFactory.CreateValidMapper();
var controller = new PaymentController(
fakeMediator,
mapper);
controller.FakeAuthentication("some-identity-name");
//Act
var paymentMethodResponse = await controller.GetCurrentPaymentMethod();
//Assert
var paymentMethod = paymentMethodResponse.ToObject <PaymentMethodResponse>();
Assert.IsNull(paymentMethod);
}