add IT test for random shuffling

[barna-isaac]

After we accidentally broke random shuffling on the site, I thought it better to have at least the one IT test. There are still a few missing cases (eg: when there’s no search term), but I didn’t want to create too many tests as we tend not write too many.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 41.02%. Comparing base (b4f8f70) to head (5a7a65b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #815      +/-   ##
==========================================
+ Coverage   40.97%   41.02%   +0.05%     
==========================================
  Files         550      550              
  Lines       23555    23555              
  Branches     2837     2837              
==========================================
+ Hits         9652     9664      +12     
+ Misses      13032    13023       -9     
+ Partials      871      868       -3     

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