parametrized modules and unit testing

[pietje]

Hi,

Thanks for the suggestion. It seems to meet the needs. I'm planning to
have MB defined as:

-define(MB, ?MODULE)

enabling me to add internal functions that act as callbacks.
This also fits nicely with eunit.

pieter

P.S. Still I would like to have something like a factory pattern, but
that's not what I asked for :-)



On Feb 22, 10:52 am, Vlad Dumitrescu <vladd...@REDACTED> wrote:
> On Mon, Feb 22, 2010 at 10:28, pietje <pieter.rij...@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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