[erlang-questions] eunit failure - "*** test module not found ***"

French, Mike <>
Wed Mar 17 12:40:55 CET 2010



> -----Original Message-----
> From:  
> [mailto:]On
> Behalf Of Graeme Defty
> Sent: 17 March 2010 07:43
> To: 
> Subject: Re: [erlang-questions] eunit failure - "*** test module not found
***"
> 
> Brilliant!
> 
> ...and almost exactly right, except that 'true' is not 
> the result of a macro but literally the last line of code.

The result and the last line are very often the same.

The result of the test-generating function will be the evaluation of 
the basic unprefixed macro, say 'ok' or 'true', which is handled like this:

  http://www.erlang.org/doc/apps/eunit/chapter.html#Primitives

which says that a single atom is interpreted as a module name,
and presumably EUnit will try to look-up test functions for that module:

  http://www.erlang.org/doc/reference_manual/modules.html#id2270797

and it's the call to true:module_info() that fails with bad module 'true'.

Mike


> On 17 March 2010 00:39, French, Mike 
> <> wrote:
> >
> > Graeme,
> >
> > I think this occurs when you omit a leading underscore
> > on an eunit macro in a test-generating function.
> >
> > For example, say you write a simple test function using a basic macro:
> >
> >  basic_test() -> ?assert( 1 + 1 =:= 2 ).
> >
> > Then you decide to convert it to a test-generating function, you should
> > append  an '_' to the function name, and
> > prepend an '_' to the macro    name:
> >
> >  fancy_test_() -> ?_assert( 1 + 1 =:= 2 ).
> >
> > but if you forget to change the macro name:
> >
> >  bad_test_() -> ?assert( 1 + 1 =:= 2 ).
> >
> > then you get the error as you describe:
> >
> >  undefined
> >  *** test module not found ***
> >  ::ok
> >  =======================================================
> >    Failed: 0.  Skipped: 0.  Passed: 0.
> >  One or more tests were cancelled.
> >  error
> >
> > The 'ok' value in the error message is the result of
> > evaluating the function returned by the macro,
> > so your mistake is on a macro that returns 'true'.
> >
> > Mike

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