fails:FileTest.executable_real? returns true if the file its an executable
fails:FileTest.executable_real? accepts an object that has a #to_path method
fails:FileTest.executable_real? returns true if named file is readable by the real user id of the process, otherwise false
fails:FileTest.executable_real? raises an ArgumentError if not passed one argument
fails:FileTest.executable_real? raises a TypeError if not passed a String type
fails:FileTest.executable_real? returns false if the file does not exist
