Test Writing: Subtracter Single Method

Created By: Geoffrey Challen

/ Version: 2021.2.0

Create a public class called Subtracter. Subtracter should store a single int in a private field and provide a public setValue method that sets the stored int to the passed value. (You can initialize the stored value to 0.) It should also provide a public method called subtract. subtract should accept an int parameter, subtract it from the stored value, and return the updated value. Do not implement getValue.

Test Design Challenge

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

• Provide a public class named TestSubtracter 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 Java's assert method