Create automatic software tests for variod

[linuxianer99]

Maybe we can use a framework like Robot framework https://robotframework.org/

[linuxianer99]

@kedder : How can we integrate these tests into Github CI ?

Think there should be a way to start the tools with one single command and got a result back after the test.

[kedder]

There is no tests yet, the tool I made so far is for "manual" testing - so I can squeeze some sound from the variod on my laptop (without real sensord). Once we have some automated tests, it should be pretty easy to integrate them with CI.

[linuxianer99]

@kedder : What do you think about Mock testing ??
Think this solves our problem with I2C and the missing hardware.
One method can be cmocka.
Example is here: https://www.samlewis.me/2016/09/embedded-unit-testing-with-cmocka/

[kedder]

@linuxianer99, I think mocking i2c might only be relevant for testing sensord. Input for variod is NMEA stream, and output is NMEA too, so no harware mocking is really needed here.

[linuxianer99]

@kedder : you are right regarding I2c. But i think we should use just one test framework for both apps.

[kedder]

I don't disagree. I don't have any experience with unit testing C programs, so I don't have a strong opinion here.

[linuxianer99]

I also have less experience with testing C programs.
But i did some test the last 2 hours:

https://www.wfbsoftware.de/2019/07/18/c-unit-testing-with-cmocka/
https://www.samlewis.me/2016/09/embedded-unit-testing-with-cmocka/

Have the first test running in sensord. (AirDensity functions):

`
#include <stdarg.h>
#include <stddef.h>
#include <setjmp.h>
#include <cmocka.h>

#include "../AirDensity.h"

static void test_AirDensity()
{
assert_float_equal(AirDensity(500.0), 1.1672, 0.005);
}

int main(int argc, char **argv)
{
const UnitTest tests[] =
{
unit_test(test_AirDensity),
};
return run_tests(tests);
}`

It's without mock, but very simple to implement ..

The output look like:

`[build@localhost sensord]$ ./testmain
[==========] Running 1 test(s).
[ RUN ] test_AirDensity
[ OK ] test_AirDensity
[==========] 1 test(s) run.
[ PASSED ] 1 test(s).

0 FAILED TEST(S)
[build@localhost sensord]$`

I can prepare something the next days and push it in a branch. So you can have a look on it ...