public void Calculate_Should_Throw_Null_If_Parameter_Is_Null()
{
//Act & Assert
Assert.ThrowsAsync <ArgumentNullException>(async() => await sut.Calculate(null));
}
public async Task <int> Handle(SumRequest request, CancellationToken cancellationToken)
{
return(await operation.Calculate(new OperationDto(request.First, request.Second)));
}