Migrate tests from rspec -> sus.

Author: ioquatix

config/sus.rb

@@ -1,7 +1,10 @@
 # frozen_string_literal: true
 
 # Released under the MIT License.
-# Copyright, 2023, by Samuel Williams.
+# Copyright, 2017-2023, by Samuel Williams.
+# Copyright, 2018, by Janko Marohnić.
+
+ENV['CONSOLE_LEVEL'] ||= 'fatal'
 
 require 'covered/sus'
 include Covered::Sus