Improvements in tests and readability of createElement fn

[felippe-regazio]

Please describe the changes this PR makes and why it should be merged:

This PR makes some simple improvements for createElement function/tests by increasing readability and turning the function smaller. Also apply some DRY rules to test/createElement.

A small performance (time complexity) improvement can be considered since there is only a single call to create an element instead many attributions, also a forEach loop has downsized the needing of some allocations downing the space complexity, but I think these points are tiny and almost imperceptible.

Obs: i didnt created a new build since i dont know if i should do it (?).

Status

• Code changes have been tested against prettier, or there are no code changes
• [ x ] I know how to update typings and have done so, or typings don't need updating

Semantic versioning classification:

• [ x ] This PR changes the codebase
  • This PR includes breaking changes (methods removed or renamed, parameters moved or removed)
  • [ x ] This PR changes the internal workings with no modifications to the external API (bug fixes, performance improvements)
• This PR only includes non-code changes, like changes to documentation, README, etc.

[netlify]

✔️ Deploy Preview for million-benchmarks ready!

🔨 Explore the source changes: c9af890

🔍 Inspect the deploy log: https://app.netlify.com/sites/million-benchmarks/deploys/60cd7cb3fc69ce0007cd33c2

😎 Browse the preview: https://deploy-preview-35--million-benchmarks.netlify.app

[aidenybai]

LGTM!