Balancing tests to save time on CI

[pariterre]

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• Have you followed the guidelines in our Contributing document [docs/contribution.md]?
• Have you checked to ensure there aren't other open [Pull Requests] for the same update/change?
• Have you opened/linked the issue related to your pull request?
• Have you used the tag [WIP] for on-going changes, and removed it when the pull request was ready?
• When ready to merge, have you sent a comment pinging @pariterre in it?

New Feature Submissions:

1. Does your submission pass the tests (if not please explain why this is intended)?
2. Did you write a proper documentation (docstrings and ReadMe)
3. Have you linted your code locally prior to submission (using the command: black . -l120 --exclude "external/*")?

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new examples for your core changes, as applicable?
• Have you written new tests for your core changes, as applicable?

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This change is 

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.26%. Comparing base (691129a) to head (627c167).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1056   +/-   ##
=======================================
  Coverage   77.26%   77.26%           
=======================================
  Files         196      196           
  Lines       21508    21508           
=======================================
  Hits        16618    16618           
  Misses       4890     4890           

Flag	Coverage Δ
unittests	77.26% <ø> (ø)

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