Unit testing c++ NCS code

[jonas.woerner]

Hi,

Im currently using Cmock and Unity like described here: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/test_and_optimize/testing_unity_cmock.html

the difference is that my usercode is written in c++, which means that I will need to instantiate classes and use strings, vectors etc. in my tests.

I got everything working up until the point where I get undefined reference to `test_suiteTearDown(int)'. when I wrap my code in extern "C"{...} I will get undefined reference to `unity_main'. I think this is due to the unity functions now being compiled with c++ linkage.

this seems to be just a tiny thing that stops me from using this setup for c++ testing but I dont know how to solve it. Any ideas?

I also tried to use Ztest with Cmock instead, but this doesnt work because NCS cmock implementation seems to depend on unity.

I would love if anyone could share some ideas on how to solve this problem.

Kind regards,

Jonas

[dejans]

Hi,

Could you show relevant parts of the code that you used?

When did you get the error? Could you provide a screenshot of the error?

Best regards,
Dejan

[jonas.woerner]

I can take a screenshot tomorrow, but you should be able to reproduce this by just taking any unity/cmock + zephyr example and renaming the runner.c to runner.cpp.

with identical code,

this works:

test_runner_generate(src/UnityTest.c)

but this not:

test_runner_generate(src/UnityTest.cpp)

[jonas.woerner]

eabi/bin/ld.bfd: app/libapp.a(runner_UnityTest.cpp.obj): in function `unity_main()':
/home/jonas/Documents/xxx/Entwicklung/bleRelay_z/twister-out/nrf52840_testing/common/bleutils.ztest/runner/runner_UnityTest.cpp:32: undefined reference to `test_suiteTearDown(int)'
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.

[jonas.woerner]

#include <unity.h>
//#include "../../../SerialHandler.h"



void test_unityexample()
{

    TEST_ASSERT_EQUAL(1,1);
}

/* It is required to be added to each test. That is because unity's
 * main may return nonzero, while zephyr's main currently must
 * return 0 in all cases (other values are reserved).
 */
extern void test_cpptest(void);
extern int unity_main(void);

int main(void)
{
	(void)unity_main();

	return 0;
}

this is the unitytest.cpp

[dejans]

Hi,

There might be some information which might be useful to you in this summary file and specifically in its C++ support section.

Best regards,
Dejan

[jonas.woerner]

not really, as its not just about Cmock. the real problem is that the unity runner does not work with a cpp file. and NCS only supports the unity runner, only way I see is building a custom runner, but thats a lot of work.

[dejans]

Hi,

I have made an internal inquiry. I will get back to you probably till the end of next week.

Best regards,
Dejan

[jonas.woerner]

thanks, its much appreciated!

[dejans]

Hi,

This is just a short update. I am still waiting for reply regarding your issue. I will get back to you as soon as I get some relevant information.

Best regards,
Dejan