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diff: adding a test reproducing error fixed by parent commit

The test location was chosen in anticipation of a future move of diff
helper classes and functions to the `hgitaly.diff`, module, as suggested in
!82 (comment 165083)
2 jobs for !86 with topic/oldstable/bugfix-NameError in 3 minutes and 30 seconds (queued for 1 second)
latest detached
Status Name Job ID Coverage
  Main
passed tests-current #263715

00:03:30

100.0%
 
  Compat
passed check-sdist #263716

00:02:06