[PR #6539/6681a460 backport][3.9] Recover missing import in circular import test

[patchback[bot]]

This is a backport of PR #6539 as merged into master (6681a460d87973d1fb55e0b62c9f6deb61801e4c).

This corrects the $sbj test by re-adding the import instruction that was lost during copy-paste from other projects to the invocation.

[codecov[bot]]

Codecov Report

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@@          Coverage Diff           @@
##             3.9    #6541   +/-   ##
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  Coverage       ?   93.36%           
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  Files          ?      104           
  Lines          ?    30502           
  Branches       ?     3067           
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  Hits           ?    28478           
  Misses         ?     1850           
  Partials       ?      174           

Flag	Coverage Δ
unit	93.28% <0.00%> (?)

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[webknjaz]

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