[ArrowStringArray] TST/CLN: cleanup str.replace tests (#41600)

Author: simonjayhawkins

pandas/core/strings/accessor.py

@@ -1354,7 +1354,7 @@ def replace(
                 )
                 if len(pat) == 1:
                     msg += (
-                        " In addition, single character regular expressions will"
+                        " In addition, single character regular expressions will "
                         "*not* be treated as literal strings when regex=True."
                     )
                 warnings.warn(msg, FutureWarning, stacklevel=3)

pandas/tests/series/methods/test_replace.py

@@ -449,14 +449,3 @@ def test_replace_with_compiled_regex(self):
         result = s.replace({regex: "z"}, regex=True)
         expected = pd.Series(["z", "b", "c"])
         tm.assert_series_equal(result, expected)
-
-    @pytest.mark.parametrize("pattern", ["^.$", "."])
-    def test_str_replace_regex_default_raises_warning(self, pattern):
-        # https://github.com/pandas-dev/pandas/pull/24809
-        s = pd.Series(["a", "b", "c"])
-        msg = r"The default value of regex will change from True to False"
-        if len(pattern) == 1:
-            msg += r".*single character regular expressions.*not.*literal strings"
-        with tm.assert_produces_warning(FutureWarning) as w:
-            s.str.replace(pattern, "")
-            assert re.match(msg, str(w[0].message))