rename the test

Author: natmokval

pandas/tests/series/indexing/test_indexing.py

@@ -404,7 +404,7 @@ def test_setitem_empty_indexer(indexer, val):
     tm.assert_frame_equal(df, expected)
 
 
-def test_loc_non_monotonic_index_with_missing_label():
+def test_loc_non_monotonic_index_with_a_missing_label():
     msg = "Cannot get left slice bound for non-monotonic index with a missing label 4"
     ser = Series([3, 6, 7, 6], index=[3, 8, 7, 6])
     with pytest.raises(KeyError, match=msg):