Simplify some assertions

[bkoelman]

Affects tests only.

QUALITY CHECKLIST

• Changes implemented in code
• Complies with our contributing guidelines
• Adapted tests
• N/A: Documentation updated

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.64%. Comparing base (32b2624) to head (19625a3).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1695   +/-   ##
=======================================
  Coverage   90.64%   90.64%           
=======================================
  Files         355      355           
  Lines       11566    11566           
  Branches     1908     1908           
=======================================
  Hits        10484    10484           
  Misses        706      706           
  Partials      376      376           

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