test: improve the tests for in_array

[jorgsowa]

Added more detailed descriptions to test iterations so it’s clear what the input is for each iteration. Additionally, I added a new test cases for an arrays containing references and enums.

[Girgias]

I'd rather split this test into multiple ones because trying to verify that 200 iterations of a foreach is corret is just unreasonable.

[jorgsowa]

Is splitting reference-value data into a separate test appropriate?

I added descriptions to each iteration to make the test results easier to review.
Additionally, I added an enum/object test cases, as it was missing before. I can

[jorgsowa]

Thanks for the review. I understand you now.

All feedback has been addressed: the large test was split into 9 files inside in_array/ subfolder with a shared .inc for the descriptive-key dictionary (renamed to $values), and enum test cases were added as well.

[Girgias]

Thanks, sorry for taking this long I was feeling somewhat unwell recently.

[jorgsowa]

No problem, thank you!