add tests for continuous batching and Default loops

[aniketmaurya]

What does this PR do?

Better tests = better software

Adds unit tests for Continuous batching.

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in GitHub issues there's a high chance it will not be merged.

Did you have fun?

Make sure you had fun coding 🙃

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91%. Comparing base (e71f38b) to head (1820b78).
Report is 1 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #396   +/-   ##
===================================
+ Coverage    88%    91%   +3%     
===================================
  Files        25     25           
  Lines      1775   1777    +2     
===================================
+ Hits       1560   1622   +62     
+ Misses      215    155   -60