Test Writing: Double Char

Imported By: Geoffrey Challen

/ Version: 2021.7.0

/ Adapted from CodingBat

Given a String, return a new String where every character in the original input is doubled. So "The" yields "TThhee".

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