fix(tests): remove unused helper function

[nijel]

It was replaced by doing this via responses.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.88%. Comparing base (247a0fb) to head (df81cf0).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1438      +/-   ##
==========================================
+ Coverage   78.87%   78.88%   +0.01%     
==========================================
  Files         353      353              
  Lines       11357    11354       -3     
  Branches      527      527              
==========================================
- Hits         8958     8957       -1     
+ Misses       2219     2217       -2     
  Partials      180      180              

Flag	Coverage Δ
unittests	78.88% <ø> (+0.01%)	⬆️

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