chore: remove import cycle in test files

[harry-hov]

See #1394

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests
• Added new benchmarks to generated graphs, if any. More info here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.81%. Comparing base (fa8eb77) to head (0f5629d).
Report is 792 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1206      +/-   ##
==========================================
- Coverage   47.86%   47.81%   -0.06%     
==========================================
  Files         369      369              
  Lines       62710    62710              
==========================================
- Hits        30018    29984      -34     
- Misses      30271    30299      +28     
- Partials     2421     2427       +6     

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[thehowl]

Closing as draft for 1yr+.