[test] Permits to debug more easily 'test_allow_reexport_package' (#8347

) (#8349)

Refs #8342

(cherry picked from commit 27a3984)

Co-authored-by: Pierre Sassoulas <pierre.sassoulas@gmail.com>

tests/checkers/unittest_imports.py

@@ -152,7 +152,7 @@ def test_allow_reexport_package(capsys: CaptureFixture[str]) -> None:
             exit=False,
         )
         output, errors = capsys.readouterr()
-        assert len(output.split("\n")) == 5
+        assert len(output.split("\n")) == 5, f"Expected 5 line breaks in:{output}"
         assert (
             "__init__.py:1:0: C0414: Import alias does not rename original package (useless-import-alias)"
             in output