Question

I have a mock module where I’d like to pass through certain function calls to the original, but the mock module hides the original. Can I call the original by path somehow, or is there a way around this?

Answer 1

You can use Meck, a mocking library for Erlang, to achieve this:

With meck you can easily mock modules
in Erlang. Since meck is intended to
be used in testing, you can also
perform some basic validations on the
mocked modules, such as making sure no
function is called in a way it should
not.

meck automatically renames existing
modules in case they are loaded when
you want to mock them, and restores
them upon unloading of the mocked
module. It is also possible to call
the original functions from a mocked
module using meck:passthrough/1 from
inside an expectation.