I'm trying to assert that a list contains a certain string. Since I'd need the condition to be evaluated case insensitively, I used a workaround (something along this blog post).
However, I'd like to know why there seems not to be a way to make the Assert.Contains method perform the comparison without regard of case sensitivity. Or is there a way to do that? (When I googled it, I only got hits on constraints for the Assert.That method on the official page for nUnit.)
There is no way to specify ignoreCase in the Assert.Contains. Whether it's something that is overlooked or intended I do not know. You can, however, use
StringAssert.AreEqualIgnoringCase(left, right);
in your unit tests to achieve the same results.
Alternatively, if you wish to stick with the Assert.Foo() "theme", you could do something like this:
Assert.IsTrue(string.Equals(left, right, StringComparison.OrdinalIgnoreCase));
or, since Contains treats arrays:
Assert.IsTrue(list.Any(element => element.ToUpper() == "VILTERSTEN"));
where you call ToUpper() on both the left and right string operands, which effectively makes the comparison ignore case as well. OrdinalIgnoreCase is to ensure some corner cases (read: Turkish) of cultures do not cause unexpected results. If you are interested in reading up on that, have a look at the Turkey test.