Add Unit Tests for handling key events in ```processing:core```

[Rishab87]

I saw a few open issues related to key events not behaving as expected. It would make sense to add unit tests for handling key events to ensure these events work as expected. The tests should cover all possible cases, especially those mentioned in the existing issues.

[SableRaf]

Thanks for opening this @Rishab87.

Which existing issues are you referring to?

[Rishab87]

I'm referring to issues like #779

[Rishab87]

I've also created a PR for this issue, can you please review it?

[Rishab87]

Hi @SableRaf, just a follow up, since this is done, so should I start adding other unit tests too?

[SableRaf]

Hi @Rishab87. Yes, go ahead!

Please open a new PR since the first one already got approved for the 4.4.1 milestone.

Thank you for your contributions 💙

[Rishab87]

Yes I'll open a seperate issue and a PR which can close it.