Example CodeScreen Ruby assessment that requires the candidate to return the nth element in the Fibonacci sequence.
The sequence is assumed to be 0-indexed, with fibonacci(0) returning 0 and fibonacci(1) returning 1.
The class to write this method in is lib/fibonacci.rb.
The tests that are run and are visible to the candidate are located in test/test_fibonacci.rb.
The tests that are run and are not visible to the candidate are located in test/test_hidden_fibonacci.rb.
Your solution also must use/be compatible with Ruby version 3.0.