[Qt-creator] Unit testing private parts of shared libraries

[Christian Gagneraud]

On 17/10/2017 8:42 pm, "Christian Gagneraud" <chgans at gmail.com> wrote:

On 17/10/2017 8:35 pm, "Elvis Stansvik" <elvstone at gmail.com> wrote:

2017-10-17 9:29 GMT+02:00 Christian Kandeler <christian.kandeler at qt.io>:
> On Mon, 16 Oct 2017 18:57:19 +0200
> Elvis Stansvik <elvstone at gmail.com> wrote:
>
>> I'm working on some tests for my own application, and started thinking
>> about unit testing of private parts of shared libraries (think the
>> _p.h/_p.cpp parts). Such parts are normally not exported AFAIK (in the
>> visibility attribute sense). This becomes a problem if you link the
>> unit tests dynamically against the code under test, as the tests won't
>> be able to see those symbols.
>>
>> So it seems to me there is only a few options:
>>
>>  1. Exporting the private parts after all,
>>  2. Adding the sources of the code under test to the unit tests,
>>  3. ?
>
> You might want to take a look at the Q_AUTOTEST_EXPORT macro in Qt and
how it is used.

Ah, didn't know about that one, thanks. That's certainly possible in
the case of Qt, where there's a "developer build" which can make this
macro effective. It does mean that you're not testing the library
as-shipped though. But I guess short of exporting everything outright,
there's no other way.


There is another way, and it's used in qbs I believe, that is option 2:


Sorry: s/Qbs/QtC/





#include "Foo.h"
#include "Foo.cpp"

class FooTest: QObject
{
...
}

It requires very low coupling tho. Which is a good practice, but not always
easy to achieve, unless you strongly stick to the cpp unit testing idiom.

My 2 cents,
Chris




Elvis

>
>
> Christian
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