Test Writing: Reformat a Phone Number

Created By: Geoffrey Challen

/ Version: 2020.9.0

Let's get some practice working with Kotlin Strings: an incredibly useful data type for working with text.

Write a function called reformatPhoneNumber. It should take a String containing a phone number in the format 111-222-3333 and return it reformatted as (111) 222-3333.

You will want to explore the various String methods to help you with this task. In particular, you may find split and substring helpful. There are solutions that use split, others that use substring, and probably others that use neither!

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 Kotlin's assert or check methods