New unit test custom challenge

JavaScript Mocha
Use the Mocha testing framework and create unit tests to grade solutions
TypeScript Mocha
Use the Mocha testing framework and create unit tests to grade solutions
Python pytest
Use the Mocha testing framework and create unit tests to grade solutions
PHP PHPUnit
Use the Mocha testing framework and create unit tests to grade solutions
Java JUnit
Use the Mocha testing framework and create unit tests to grade solutions
Kotlin JUnit
Use the Mocha testing framework and create unit tests to grade solutions