LanX: After useing test_v1.pm you have to make Perl believe that package Foo and package Foo::Bar have already been loaded ...

That makes only sense if you want to prevent Foo/Bar.pm being read from disk if a use Foo::Bar; is executed after the usurping module test_v1.pm has been loaded. Depending on load order can be tricky if Foo/Bar.pm initializes stuff or runs BEGIN blocks.

Unfortunately we don't know the intentions of the original poster, so apparently the lot of us have made different assumptions. I have seen (and used) multiple packages in one module in these cases:

• For "internal" classes which are not seen from the outside, where no one is ever supposed to "use" the module. In that case, modifying %INC isn't necessary.
• To modify the behaviour of classes in a test: In that case, my test_v1.pm would explicitly use Foo::Bar and then do the desired modifications in a block { package Foo::Bar; no warnings "redefine"; ...; }. Modifying %INC isn't necessary either.

Cheers,
haj

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