Packages Collection.
The Perl 5 module Test::MockModule lets you temporarily redefine
subroutines in other packages for the purposes of unit testing.
A Test::MockModule object is set up to mock subroutines for a given
module. The object remembers the original subroutine so it can be
easily restored. This happens automatically when all MockModule
objects for the given module go out of scope, or when you unmock()
the subroutine.
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