Add tests

[ncrypthic]

I will be very helpful for others to adopt blockqueue if you add tests. At the very least, this will make others to:

1. Confidently contributes to the repository
2. Confident enough to try it because it was tests

Cheers

[yudhasubki]

thanks for opening the discussion @ncrypthic,

unit tests and CI are now in progress, I hope this can be completed as soon as possible 🥂

[ncrypthic]

Cool, will look for it 👍