diff --git a/__pycache__/library.cpython-37.pyc b/__pycache__/library.cpython-37.pyc
index 583d9ee..2338485 100644
Binary files a/__pycache__/library.cpython-37.pyc and b/__pycache__/library.cpython-37.pyc differ
diff --git a/tests/__pycache__/test_library.cpython-37.pyc b/tests/__pycache__/test_library.cpython-37.pyc
index 3e18ba7..f11933c 100644
Binary files a/tests/__pycache__/test_library.cpython-37.pyc and b/tests/__pycache__/test_library.cpython-37.pyc differ
diff --git a/tests/test_library.py b/tests/test_library.py
index e8e5be7..61eb1bc 100755
--- a/tests/test_library.py
+++ b/tests/test_library.py
@@ -8,7 +8,7 @@ class Testing(unittest.TestCase):
         self.assertIsNotNone(Catalogue())
 
     def test_library_catalogue_filter_books(self):
-        self.assertIsNotNone(Catalogue().filter_books())
+        self.assertIsNotNone(Catalogue().filter_books(1))
 
 if __name__ == '__main__':
     unittest.main()