test corner case

Author: charlesdong1991

pandas/tests/io/formats/test_format.py

@@ -2380,6 +2380,17 @@ def test_to_string_header(self):
         exp = '0    0\n    ..\n9    9'
         assert res == exp
 
+    @pytest.mark.parametrize("input_series, expected", [
+        ([' a', ' b'], ' a\n b'),
+        (['.1', '1'], '.1\n 1'),
+        (['10', '-10'], ' 10\n-10')
+    ])
+    def test_to_string_index_false_corner_case(self,
+                                              input_series,
+                                              expected):
+        s = pd.Series(input_series).to_string(index=False)
+        assert s == expected
+
 
 def _three_digit_exp():
     return '{x:.4g}'.format(x=1.7e8) == '1.7e+008'