[erlang-questions] parametrized modules and unit testing

Ken Robinson kenrobinsonster@REDACTED
Mon Feb 22 13:18:13 CET 2010

I've not used this module but it appears to give the behavior you want.


On Mon, Feb 22, 2010 at 7:52 PM, Vlad Dumitrescu <vladdu55@REDACTED> wrote:
> On Mon, Feb 22, 2010 at 10:28, pietje <pieter.rijken@REDACTED> wrote:
>> Suppose I have 2 modules, say ma and mb, and that module ma uses
>> (imports) module mb.
>> I'm trying to figure out in Erlang how to write unit tests for module
>> ma that do not depend on the particular
>> implementation of functions in module mb.
> Hi,
> One simple way is to use conditional compilation; in ma use
> -ifdef(TEST).
>    -include_lib("eunit/include/eunit.hrl").
>    -define(MB, mock_mb).
> -else.
>    -define(MB, mb).
> -endif.
> and make all calls to mb via ?MB. (Of course, you'll have to implement
> a mock_mb module).
> A more advanced way would be to have a central mock server where you
> can register a fun for each mocked function (in any module) and use
> error_handler:undefined_function to use these registered funs instead
> of the real ones. This is quite complex to implement, though.
> best regards,
> Vlad
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