comment issue number under test

To allow the developers to remember why the specific test was added

Author: Nikoleta-v3

pandas/tests/series/test_constructors.py

@@ -138,10 +138,12 @@ def test_constructor_no_data_index_order(self):
         assert result.index.tolist() == ['b', 'a', 'c']
 
     def test_constructor_no_data_string_type(self):
+        # GH 22477
         result = pd.Series(index=[1], dtype=str)
         assert result.isna().all()
 
     def test_constructor_single_element_string_type(self):
+        # GH 22477
         result = pd.Series(13, index=[1], dtype=str)
         assert result.values.tolist() == ['13']