add parametrize for suffixes

Author: charlesdong1991

pandas/tests/reshape/merge/test_merge.py

@@ -1459,10 +1459,15 @@ def test_merge_suffix(col1, col2, suffixes, expected_cols):
     assert df.columns.tolist() == expected_cols
 
 
-def test_merge_suffix_errors():
+@pytest.mark.parametrize("suffixes", [
+    (None, None),
+    ('', None),
+    (None, '')
+])
+def test_merge_suffix_errors(suffixes):
     # 24819
     a = pd.DataFrame({0: [1, 2, 3]})
     b = pd.DataFrame({0: [4, 5, 6]})
 
     with pytest.raises(ValueError, match="columns overlap but no suffix specified"):
-        a.merge(b, left_index=True, right_index=True, suffixes=(None, None))
+        a.merge(b, left_index=True, right_index=True, suffixes=suffixes)