Question

In nunit, suppose we have more than one actual values for the specific function to return, how should I frame the assert function ? Which function should I use ?

Ex:

int function(..) {
.
.
.
    a = some_operation();
    if (a == 0)
       result = 0;
    else if (a == some_predefined_value)
       result = 1;
    else if (a == some_predefined_value)
       result = 2;
    else
       correct_usage();

     return result;
}

Answer 1

I think you may want to use CollectionAssert. This lets you verify that a value or set of values is contained within another.

CollectionAssert.Contains(new[] { 1, 2, 3 }, 2);
CollectionAssert.IsSubsetOf(new[] {1, 2 }, new[] {1, 2, 3, 4});

You may notice that the first method is checking for the second argument in the first IEnumerable and the second is asserting that the first argument (IEnumerable) is a subset of the second argument, also a IEnumerable.