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Editorial Team
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Asked: 2026-05-29T17:42:52+00:00

Let us say I have a module called example.erl In this module I use

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Let us say I have a module called example.erl

In this module I use the following construct for debugging:

%%% Switch debugging output on/off:
%-define(DBG(Str, Args), ok).
-define(DBG(Str, Args), io:format(Str, Args)).

It helps me to output various debugging info into the Erlang shell:

?DBG("Function fun1 starting... ~n", [])

But if I call example.erl from example_tests with example:test(), this output info does not appear.

How can I make it visible during a EUnit test?

UPD: I have found some related info, but I still do not know how to solve the issue.

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1 Answer

  1. Editorial Team

    As describe in the page you mention, you can use debugMsg or debugFmt.

    ?debugMsg("Function fun1 starting...")

    or

    ?debugFmt("Function fun1 starting...", [])

    Make sure you have include eunit’s header file in your module file.

    -include_lib("eunit/include/eunit.hrl").

    If you want to disable debug macros for example in staging, define NODEBUG in compiling modules.

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