How do you test code that uses prototypes?

Testing code with prototypes can be challenging due to their specific behavior, especially in Perl. Prototypes in Perl allow you to enforce the expected type and number of arguments passed to a subroutine. Here's an example of how to test code that uses prototypes:

 sub foo($) {
        my ($arg) = @_;
        return $arg * 2;
    }
    
    print foo(5);  # This should output 10
    print foo("abc");  # This will cause an error

When writing tests, ensure that you provide the correct number and type of arguments, as prototypes will affect how your arguments are interpreted.