[PR #6539/6681a460 backport][3.8] 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.