Description:

Given a list of Perl modules/filenames, this module makes require and
use statements fail (no matter the specified files/modules are
installed or not).

They die with a message like:

Can't locate Module/ToHide.pm (hidden)

The original intent of this module is to allow Perl developers to test
for alternative behavior when some modules are not available. In a
Perl installation, where many modules are already installed, there is
a chance to screw things up because you take for granted things that
may not be there in other machines.

For example, to test if your distribution does the right thing when a
module is missing, you can do