Added test to confirm fix for pandas-dev#28658

adds a test to check for regressions later.

Author: kognate

pandas/tests/series/test_arithmetic.py

@@ -66,6 +66,14 @@ def test_add_series_with_period_index(self):
         with pytest.raises(IncompatibleFrequency, match=msg):
             ts + ts.asfreq("D", how="end")
 
+    def test_string_addition(self):
+        # GH28658
+        a = Series(["hello", "world"])
+
+        result = a + "!"
+        expected = Series(["hello!", "world!"])
+        assert_series_equal(result, expected)
+
 
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