Multiple asserts in single test file naming

[komkovla]

Summary

• 🐛 Fix having multiple asserts in single test resulted in name clash and test fail.
• ✨ Implement counter - singleton for getting count of the snapshot on specific test-device-size combination
• ❗ Breaking Change - naming of snapshots newly would have _1 suffix so already existing snapshots would need to be renamed

Resolves bug #6

Author checklist

• updated changelog under Next section

[olejnjak]

I think that with those two minor tweaks we can maintain backwards compatibility, which would be desirable, what do you think?

[komkovla]

I think that with those two minor tweaks we can maintain backwards compatibility, which would be desirable, what do you think?

Yes, thank you for this improvement!