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If you're not so

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sure you implemented something correctly,
it's always a good idea to add some tests.

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Let's add tests to our tabloid pile
class to let us know if our addCards and

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removeCards functions are working
like we want them to.

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And before I get to that, I want to make
sure that this is the addCards function.

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Okay, now let's start by first creating
a test folder for our project.

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First, create just a regular directory
named Test in the root of your project.

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Then open the project structure window,
file, project structure,

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and on the Modules tab, select your
test folder and mark it as Tests.

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Then hit OK and
now we've got a spot for our tests.

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Next up, let's create the tests.

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Click somewhere in your Tableau
pile class and then use Command or

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CTRL+SHIFT+T and
hit Enter to create a new test.

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Then for the testing library,
make sure you've selected JUnit4 and for

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the members, let's pick addCards and
removeCards.

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Also if you have something up here
that says fix, just click on it and

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pick the intellijay distribution.

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Then hit OK, and now it's testing time.

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Remember for each test,
we need to do three things.

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We need to arrange the objects we need,
act on those objects, and

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then assert that we got the right result.

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So let's start by adding
in these steps as comments.

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You can find them in the teacher's
notes below as well.

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All right, let's take it from
the top with the addCcards function.

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To test that our addCards function is
working, we're going to need one Tableau

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pile and one mutable list of cards
to add to that Tableau pile.

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So in the Arrange section, let's
start by creating a new Tableau pile.

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val tableauPile

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= TableauPile.

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And then let's initialize our Tableau
pile to contain only the King of spades,

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mutable list of card with a value
of 12 for King and then spades.

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On the next line,
let's create a new variable for

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the cards we're going to
add to our Tableau pile.

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Val cards and
let's set this equal to a list of

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one of the cards that would come after
this one, or choose the Queen of hearts.

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So mutable list of and

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then the Queen of hearts, which has
a value of 11 and a suit of hearts.

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Moving on to the act section,

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let's try adding that cards
list to our Tableau pile.

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tableuPile.addCards and
pass in our cards list.

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And finally in the assert section,
let's check that our Tableau has the right

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number of cards which sends red Queen
does match with the black King is two.

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So assertEquals 2 for
the expected value and for

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the actual value, tableauPile.cards.size.

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Then let's hit the Run
button next to our test.

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And it looks like the addCards function
works, well, at least for those two cards.

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Anyhow in the next video,
we'll continue the quest for

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testing with our removeCards function.