Test Writing: Double Up

Created By: Chris Taylor

/ Version: 2023.6.0

Write a method, doubleUp, that accepts a List<String> and returns a List<String> where each String in the original list is concatenated with itself. Your solution must not use loops and must use at least one lambda expression.

• ["a", "b"] -> ["aa", "bb"]
• ["", "last"] -> ["", "lastlast"]

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