STYLE: add newline at end of file

Author: Lakshya-Upadhyaya

pandas/tests/indexes/test_common.py

@@ -529,4 +529,4 @@ def test_join_series_deprecated():
     idx = pd.Index([1, 2])
     ser = pd.Series([1, 2, 2])
     with tm.assert_produces_warning(Pandas4Warning, match="Passing a Series"):
-        idx.join(ser)
+        idx.join(ser)