Test Writing: Binary Tree Count Leaves

Created By: Geoffrey Challen

/ Version: 2020.11.0

Create a public class BinaryTreeCounter that provides a single class method named countLeaves that accepts a single BinaryTree and counts the number of leaves in the tree. As a reminder, a leaf node has no children. If the passed tree is null, you can return 0, since an empty tree has no nodes and so no leaf nodes.

For reference, cs125.trees.BinaryTree has the following public properties:

Test Design Challenge

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

• Provide a public class named TestBinaryTreeCounter 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