This is Perl module Test::Mock::Guard. INSTALLATION Test::Mock::Guard installation is straightforward. If your CPAN shell is set up, you should just be able to do % cpan Test::Mock::Guard Download it, unpack it, then build it as per the usual: % perl Makefile.PL % make && make test Then install it: % make install DOCUMENTATION Test::Mock::Guard documentation is available as in POD. So you can do: % perldoc Test::Mock::Guard to read the documentation online with your favorite pager. Toru Yamaguchi