If the file name is MyTest.pm, just do use MyTest or BEGIN { require "MyTest.pm"; } (subbtle differences left to you to lookup). use doesn't care what packages are used inside the file. For example,
use Bah looks for Bah.pm, and
use Foo::Bar looks for Foo/Bar.pm,
even if they contain packages
Cow::Moo,
Cow::Eat and
Milkmaid.
perl looks for the modules in the the paths listed in @INC. See use lib for a method to edit @INC.

In reply to Re: Multiple classes in modules by ikegami
in thread Multiple classes in modules by ArmchairDissident

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