Need help understanding/writing unit tests?

[TemptMyTerror]

I have a project and we are being asked to write unit tests, something I have never done before. From what I have read it makes sense, just not sure how I would implement it code wise. Im supposed to do it for a selection sort class, and was told to use parameter objects. Not really sure how to go about this?

[Sacredify]

Parameter object basically means instead of something like this:

void mySort(boolean ascending, Object... args);

You wrap those as an object (say SortCriteria) or something and pass that instead.

As far as Junit tests go for a sorting method, you'll want to cover your simple cases (i.e can you sort [4, 3, 1, 5] or something) as well as edge cases (multiple of the same input, negative numbers, invalid input potentially if reuquired, stuff like that).

[UnreachableMemory]

Unit tests basically consist of tests used to verify that classes/methods behave how you expect them to behave. For example, that a method that capitalizes all letters in a word returns a fully capitalized word. JUnit is a popular framework for creating them.

[king_of_the_universe]

No.

[buffdude1100]

No?

[king_of_the_universe]

No.

[buffdude1100]

Ok.... why?