parametrize tests

Author: Terji Petersen

pandas/tests/series/test_constructors.py

@@ -83,52 +83,25 @@ def test_unparseable_strings_with_dt64_dtype(self):
             # test for None or an empty generator.
             # test_constructor_pass_none tests None but only with the index also
             # passed.
-            (lambda: Series(), True),
-            (lambda: Series(None), True),
-            (lambda: Series({}), True),
-            (lambda: Series(()), False),  # creates a RangeIndex
-            (lambda: Series([]), False),  # creates a RangeIndex
-            (lambda: Series(_ for _ in []), False),  # creates a RangeIndex
-            (lambda: Series(data=None), True),
-            (lambda: Series(data={}), True),
-            (lambda: Series(data=()), False),  # creates a RangeIndex
-            (lambda: Series(data=[]), False),  # creates a RangeIndex
-            (lambda: Series(data=(_ for _ in [])), False),  # creates a RangeIndex
+            (lambda idx: Series(index=idx), True),
+            (lambda idx: Series(None, index=idx), True),
+            (lambda idx: Series({}, index=idx), True),
+            (lambda idx: Series((), index=idx), False),  # creates a RangeIndex
+            (lambda idx: Series([], index=idx), False),  # creates a RangeIndex
+            (lambda idx: Series((_ for _ in []), index=idx), False),  # RangeIndex
+            (lambda idx: Series(data=None, index=idx), True),
+            (lambda idx: Series(data={}, index=idx), True),
+            (lambda idx: Series(data=(), index=idx), False),  # creates a RangeIndex
+            (lambda idx: Series(data=[], index=idx), False),  # creates a RangeIndex
+            (lambda idx: Series(data=(_ for _ in []), index=idx), False),  # RangeIndex
         ],
     )
-    def test_empty_constructor(self, constructor, check_index_type):
+    @pytest.mark.parametrize("empty_index", [None, None])
+    def test_empty_constructor(self, constructor, check_index_type, empty_index):
         # TODO: share with frame test of the same name
-        expected = Series()
-        result = constructor()
-
-        assert result.dtype == object
-        assert len(result.index) == 0
-        tm.assert_series_equal(result, expected, check_index_type=check_index_type)
-
-    @pytest.mark.parametrize(
-        "constructor,check_index_type",
-        [
-            # NOTE: some overlap with test_constructor_empty but that test does not
-            # test for None or an empty generator.
-            # test_constructor_pass_none tests None but only with the index also
-            # passed.
-            (lambda: Series(index=[]), True),
-            (lambda: Series(None, index=[]), True),
-            (lambda: Series({}, index=[]), True),
-            (lambda: Series((), index=[]), False),  # creates a RangeIndex
-            (lambda: Series([], index=[]), False),  # creates a RangeIndex
-            (lambda: Series((_ for _ in []), index=[]), False),  # creates a RangeIndex
-            (lambda: Series(data=None, index=[]), True),
-            (lambda: Series(data={}, index=[]), True),
-            (lambda: Series(data=(), index=[]), False),  # creates a RangeIndex
-            (lambda: Series(data=[], index=[]), False),  # creates a RangeIndex
-            (lambda: Series(data=(_ for _ in []), index=[]), False),  # RangeIndex
-        ],
-    )
-    def test_empty_constructor_with_index(self, constructor, check_index_type):
-        # GH 49573
-        expected = Series()
-        result = constructor()
+        # GH 49573 (addition of empty_index parameter)
+        expected = Series(index=empty_index)
+        result = constructor(empty_index)
 
         assert result.dtype == object
         assert len(result.index) == 0