diff --git a/test_team_aggie_annihilators.py b/test_team_aggie_annihilators.py
index e77d754..08eff32 100644
--- a/test_team_aggie_annihilators.py
+++ b/test_team_aggie_annihilators.py
@@ -11,6 +11,9 @@ def test_show_aggie_pride(self):
 
     def test_aba_routing_number(self):
         """Test ABA_ROUTING_NUMBER functionality"""
+          self.assertIsInstance(ABA_ROUTING_NUMBER, str)
+          self.assertEqual(len(ABA_ROUTING_NUMBER), 9)
+          self.assertTrue(ABA_ROUTING_NUMBER.isdigit())
 
     def test_au_abn(self):
         """Test AU_ABN functionality"""