add more dtypes to tests

Author: reidy-p

pandas/tests/series/test_constructors.py

@@ -142,21 +142,23 @@ def test_constructor_list_like(self):
             result = Series(obj, index=[0, 1, 2])
             assert_series_equal(result, expected)
 
-    @pytest.mark.parametrize('input_vals, dtype, expected', [
-        ([1, 2, 3], 'str', ['1', '2', '3']),
-        ([1, 2, 3], str, ['1', '2', '3']),
-        ([1, 2, 3], 'U', ['1', '2', '3']),
-        ([1.0, 2.0, 3.0], 'str', ['1.0', '2.0', '3.0']),
-        ([1.0, 2.0, 3.0], str, ['1.0', '2.0', '3.0']),
-        ([1.0, 2.0, 3.0], 'U', ['1.0', '2.0', '3.0'])
+    @pytest.mark.parametrize('input_vals', [
+        ([1, 2]),
+        ([1.0, 2.0, np.nan]),
+        (['1', '2']),
+        (pd.date_range('1/1/2011', periods=2)),
+        (pd.date_range('1/1/2011', periods=2, tz='US/Eastern')),
+        (pd.Interval(left=0, right=5)),
     ])
-    def test_constructor_list_str(self, input_vals, dtype, expected):
+    def test_constructor_list_str(self, input_vals):
         # GH 16605
         # Ensure that data elements are converted to strings when
         # dtype is str, 'str', or 'U'
 
-        result = Series(input_vals, dtype=dtype)
-        assert_series_equal(result, Series(expected))
+        for dtype in ['str', str, 'U']:
+            result = Series(input_vals, dtype=dtype)
+            expected = Series(input_vals).astype(dtype)
+            assert_series_equal(result, expected)
 
     def test_constructor_generator(self):
         gen = (i for i in range(10))