Cleaned up backend tests

[jesper-friis]

Description

Just some cleanup of the backend tests.

Added a pip freeze to CI tests for easier debugging.

Updated requirements in pyproject.toml as suggested by Francesca. Lower version range for dependencies has been tested manually.

Type of change

• Bug fix and code cleanup
• New feature
• Documentation update
• Testing

Checklist for the reviewer

This checklist should be used as a help for the reviewer.

• Is the change limited to one issue?
• Does this PR close the issue?
• Is the code easy to read and understand?
• Do all new feature have an accompanying new test?
• Has the documentation been updated as necessary?
• Is the code properly tested?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (master@85d40ee). Learn more about missing BASE report.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #230   +/-   ##
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  Coverage          ?   78.41%           
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  Files             ?       18           
  Lines             ?     1696           
  Branches          ?        0           
=========================================
  Hits              ?     1330           
  Misses            ?      366           
  Partials          ?        0           

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