You might consider Test::Resub. That would look something like this: 
my $handle = Test::Resub->new({
  name => 'Foo::bar',
  code => sub { "mocked out behavior" },
});

# now do something that calls Foo::bar

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In reply to Re: Test::MockObject and imported functions by smerritt
in thread Test::MockObject and imported functions by Mutant

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