There is a much cleaner and easier way:

{
  local *Foo::new = sub {
    require MockFoo;
    return MockFoo->new;
  };
  ... tests ...
};

# Foo::new is restored to its old value

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In reply to Re: locally redefining subroutine in module by Corion
in thread locally redefining subroutine in module by Jasper

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