Test::Resub 1.02

Test::Resub is a lexically scoped subroutine replacement for testing.

SYNOPSIS

#!/usr/bin/perl

use Test::More tests => 4;
use Test::Resub qw(resub);

{
package Somewhere;
sub show {
my ($class, $message) = @_;
return "$class, $message";
}
}

# sanity
is( Somewhere->show(beyond the sea), Somewhere, beyond the sea );

# scoped replacement of subroutine with argument capturing
{
my $rs = resub Somewhere::show, sub { hi }, capture => 1;
is( Somewhere->show(over the rainbow), hi );
is_deeply( $rs->method_args, [[over the rainbow]] );
}

# scope ends, resub goes away, original code returns
is( Somewhere->show(waiting for me), Somewhere, waiting for me );

This module allows you to temporarily replace a subroutine/method with arbitrary code. Later, you can tell how many times was it called and with what arguments each time. You can also specify that the subroutine/method must get called, must not get called, or may be optionally called.