[erlang-questions] Error in Common Tests

Roberto Ostinelli <>
Thu Apr 30 15:47:45 CEST 2015


Thank you Peter! :)

On Wed, Apr 29, 2015 at 3:27 PM, Peter Andersson <> wrote:

>
> Roberto,
>
> You won't get test case line info if it's the last line of execution that
> causes the timetrap timeout. Because of tail call elimination the
> {Suite,Testcase,Line} info is not saved on stack unless there's a trailing
> expression. I.e.
>
> tc(_) -> func_that_may_not_return().
>
> will not generate test case line info if it fails, but
>
> tc(_) -> func_that_may_not_return(), ok.
>
> will.
>
> That said, Common Test removes internal common_test and test_server
> elements from the stack before printing the stack trace to the log. This
> operation is too agressive and removes all elements if no
> {Suite,Testcase,Line} tuple is found "to sync with". Knowing it must be the
> last call in the test case causing the timeout and knowing which internal
> function executed the test case, I should be able to print relevant stack
> info to the log even when a test case tuple is not present due to tail call
> elimination. Fix is coming asap...
>
> Best,
> Peter
>
> Ericsson AB, Erlang/OTP
>
>
>
> On 2015-04-29 13:15, Roberto Ostinelli wrote:
>
> Loïc,
> Yes that did help me. It just stated {error,eoc} (i.e. no line of where
> this happened) but at least I could track it down to the issue.
>
>  Thank you.
> r.
>
> On Wed, Apr 29, 2015 at 12:58 PM, Loïc Hoguin <> wrote:
>
>> Did you look inside the HTML logs that Common Test generates? They
>> usually contain the complete error and stacktrace, while the console only
>> gets partials.
>>
>>
>> On 04/29/2015 01:54 PM, Roberto Ostinelli wrote:
>>
>>>  Dear list,
>>> When running CT I have a test where I get:
>>>
>>> - - - - - - - - - - - - - - - - - - - - - - - - - -
>>> Error detected: {'EXIT',{badmatch,{...}}}
>>> - - - - - - - - - - - - - - - - - - - - - - - - - -
>>>
>>> No additional information. My application logs do not show any errors.
>>>
>>> Weirdly enough, if I put a timer:sleep(10) somewhere in my code, this
>>> error does not show up anymore.
>>>
>>> Thing is: how can I get CT to tell me the module / line where this error
>>> happens?
>>>
>>> Thank you,
>>> r.
>>>
>>>
>>>  _______________________________________________
>>> erlang-questions mailing list
>>> 
>>> http://erlang.org/mailman/listinfo/erlang-questions
>>>
>>>
>> --
>> Loïc Hoguin
>> http://ninenines.eu
>>
>
>
>
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