add test for strings

Author: Nikoleta-v3

pandas/tests/series/test_constructors.py

@@ -147,6 +147,11 @@ def test_constructor_single_element_string_type(self):
         result = pd.Series(13, index=[1], dtype=str)
         assert result.values.tolist() == ['13']
 
+    def test_constructor_string_series_string_type(self):
+        # GH 22477
+        result = pd.Series('entry', index=[1], dtype=str)
+        assert result.values.tolist() == ['entry']
+
     def test_constructor_dtype_str_na_values(self, string_dtype):
         # https://github.com/pandas-dev/pandas/issues/21083
         ser = Series(['x', None], dtype=string_dtype)