Test Writing: String Character Sum

Created By: Geoffrey Challen

/ Version: 2021.2.0

Write a function called characterSum that sums the characters in a String and returns the result as an int. If the String is null you should return 0. You should sum the characters based on their character code value, like this:

There are several ways to approach this problem, and you may want to look into either the charAt or toCharArray String methods.

Test Design Challenge

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

• Provide a 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