t: Add a unit test for latest_jobs until argument

[kalikiana]

The optional argument takes a time and is currently uncovered.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.23%. Comparing base (0d7dc8c) to head (9c931ae). Report is 1040 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5041      +/-   ##
==========================================
- Coverage   98.24%   98.23%   -0.01%     
==========================================
  Files         381      381              
  Lines       35857    35861       +4     
==========================================
+ Hits        35227    35229       +2     
- Misses        630      632       +2     

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