chore: fix lint error in bookshelf/main_test.py (#490)

* chore: fix lint error in bookshelf/main_test.py

* linting

Author: kweinmeister

bookshelf/main_test.py

@@ -40,15 +40,15 @@ def app(request):
 
 @pytest.fixture
 def firestore():
-
-    import firestore
     """This fixture provides a modified version of the app's Firebase model
     that tracks all created items and deletes them at the end of the test.
 
     Any tests that directly or indirectly interact with the database should
     use this to ensure that resources are properly cleaned up.
     """
 
+    import firestore
+
     # Ensure no books exist before running the tests. This typically helps if
     # tests somehow left the database in a bad state.
     delete_all_books(firestore)