Move backwards tests to separate test directory

[jan-janssen]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.15%. Comparing base (35d261b) to head (53e5728).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1820      +/-   ##
==========================================
+ Coverage   75.13%   75.15%   +0.01%     
==========================================
  Files          80       80              
  Lines       10414    10414              
==========================================
+ Hits         7825     7827       +2     
+ Misses       2589     2587       -2     

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