diff --git a/tests/test_utils.py b/tests/test_utils.py
index 47ed1ec..96c16d9 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -23,6 +23,18 @@ def setUp(self):
         self.cluster_idx_list = [0, 1]
         self.cluster_idx_np = np.array([0, 1])
 
+    def test_valid_input_marginals(self):
+        result = generate_contin_table_with_clustered_AE(
+            row_marginal=self.contin_table_np.sum(axis=1),
+            column_marginal=self.contin_table_np.sum(axis=0),
+            signal_mat=self.signal_mat,
+            cluster_idx=self.cluster_idx_list,
+            n=5,
+            rho=0.5,
+        )
+        self.assertEqual(len(result), 5)
+        self.assertTrue(all(isinstance(table, np.ndarray) for table in result))
+
     def test_valid_input_dataframe(self):
         result = generate_contin_table_with_clustered_AE(
             row_marginal=None,