Test Writing: Simple Object Method

Created By: Geoffrey Challen

/ Version: 2020.9.0

Let's continue our exploration of Kotlin objects, which combine state and behavior. We've seen how to create an object that stores a single value. Now let's see how to create an object that implements a single method acting on stored data. Again, this is not representative of the true power of Kotlin objects, but we're just getting started!

Create a class called Simple. Simple should store a single Int value which you can initialize to 0. It should also provide a public method called squared that takes no parameters and returns the stored value, squared.

Test Design Challenge

You're challenge is to write tests for this problem described above.

• Provide a public class named TestSimple with a single non-private class method named test that accepts no arguments and does not return a value.
• If the implementation of the class described above is incorrect, your test method should throw an exception.
• If it is correct, do not throw an exception.
• You may want to use Kotlin's assert or check methods