undid the changed tests

Author: SaturnFromTitan

pandas/core/indexes/base.py

@@ -5604,7 +5604,7 @@ def _validate_join_method(method: str):
 def default_index(n):
     from pandas.core.indexes.range import RangeIndex
 
-    return RangeIndex(0, n)
+    return RangeIndex(0, n, name=None)
 
 
 def maybe_extract_name(name, obj, cls) -> Label:

pandas/tests/extension/base/missing.py

@@ -19,7 +19,7 @@ def test_isna(self, data_missing):
 
         # GH 21189
         result = pd.Series(data_missing).drop([0, 1]).isna()
-        expected = pd.Series([], dtype=bool, index=pd.RangeIndex(0))
+        expected = pd.Series([], dtype=bool)
         self.assert_series_equal(result, expected)
 
     def test_dropna_array(self, data_missing):

pandas/tests/extension/decimal/test_decimal.py

@@ -86,7 +86,7 @@ def convert(x):
         else:
             right_na = right.isna()
 
-        tm.assert_series_equal(left_na, right_na, *args, **kwargs)
+        tm.assert_series_equal(left_na, right_na)
         return tm.assert_series_equal(left[~left_na], right[~right_na], *args, **kwargs)
 
     @classmethod

pandas/tests/extension/test_sparse.py

@@ -187,7 +187,7 @@ def test_isna(self, data_missing):
 
         # GH 21189
         result = pd.Series(data_missing).drop([0, 1]).isna()
-        expected = pd.Series([], dtype=expected_dtype, index=pd.RangeIndex(0))
+        expected = pd.Series([], dtype=expected_dtype)
         self.assert_series_equal(result, expected)
 
     def test_fillna_limit_pad(self, data_missing):

pandas/tests/frame/test_constructors.py

@@ -87,9 +87,9 @@ def test_empty_constructor(self, constructor):
     @pytest.mark.parametrize(
         "emptylike,expected_index,expected_columns",
         [
-            ([[]], RangeIndex(1), Index([])),
-            ([[], []], RangeIndex(2), Index([])),
-            ([(_ for _ in [])], RangeIndex(1), Index([])),
+            ([[]], RangeIndex(1), RangeIndex(0)),
+            ([[], []], RangeIndex(2), RangeIndex(0)),
+            ([(_ for _ in [])], RangeIndex(1), RangeIndex(0)),
         ],
     )
     def test_emptylike_constructor(self, emptylike, expected_index, expected_columns):
@@ -342,7 +342,7 @@ def test_constructor_dict(self):
 
         # with dict of empty list and Series
         frame = DataFrame({"A": [], "B": []}, columns=["A", "B"])
-        tm.assert_index_equal(frame.index, Index([]))
+        tm.assert_index_equal(frame.index, Index([], dtype=np.int64))
 
         # GH 14381
         # Dict with None value

pandas/tests/groupby/test_filters.py

@@ -97,7 +97,7 @@ def test_filter_out_all_groups_in_df():
     df = pd.DataFrame({"a": [1, 1, 2], "b": [1, 2, 0]})
     res = df.groupby("a")
     res = res.filter(lambda x: x["b"].sum() > 5, dropna=True)
-    expected = pd.DataFrame({"a": [], "b": []}, dtype="int64", index=pd.RangeIndex(0))
+    expected = pd.DataFrame({"a": [], "b": []}, dtype="int64")
     tm.assert_frame_equal(expected, res)
 
 

pandas/tests/groupby/test_grouping.py

@@ -611,7 +611,10 @@ def test_list_grouper_with_nat(self):
     @pytest.mark.parametrize(
         "func,expected",
         [
-            ("transform", pd.Series(name=2, dtype=np.float64)),
+            (
+                "transform",
+                pd.Series(name=2, dtype=np.float64, index=pd.RangeIndex(0, 0, 1)),
+            ),
             (
                 "agg",
                 pd.Series(name=2, dtype=np.float64, index=pd.Float64Index([], name=1)),
@@ -635,13 +638,10 @@ def test_evaluate_with_empty_groups(self, func, expected):
     def test_groupby_empty(self):
         # https://github.com/pandas-dev/pandas/issues/27190
         s = pd.Series([], name="name", dtype="float64")
-
-        expected = s.copy()
-        expected.index = pd.RangeIndex(0)
-
         gr = s.groupby([])
+
         result = gr.mean()
-        tm.assert_series_equal(result, expected)
+        tm.assert_series_equal(result, s)
 
         # check group properties
         assert len(gr.grouper.groupings) == 1

pandas/tests/io/json/test_pandas.py

@@ -213,16 +213,13 @@ def test_roundtrip_empty(self, orient, convert_axes, numpy, empty_frame):
         )
         expected = empty_frame.copy()
 
-        # TODO: conditions below are probably bugs
+        # TODO: both conditions below are probably bugs
         if convert_axes:
+            expected.index = expected.index.astype(float)
             expected.columns = expected.columns.astype(float)
-
         if numpy and orient == "values":
             expected = expected.reindex([0], axis=1).reset_index(drop=True)
 
-        if convert_axes:
-            expected.index = expected.index.astype(float)
-
         tm.assert_frame_equal(result, expected)
 
     @pytest.mark.parametrize("convert_axes", [True, False])
@@ -635,7 +632,8 @@ def test_series_roundtrip_empty(self, orient, numpy, empty_series):
         expected = empty_series
         if orient in ("values", "records"):
             expected = expected.reset_index(drop=True)
-        expected.index = expected.index.astype(float)
+        else:
+            expected.index = expected.index.astype(float)
 
         tm.assert_series_equal(result, expected)
 

pandas/tests/reshape/test_concat.py

@@ -2203,8 +2203,7 @@ def test_concat_empty_series_timelike(self, tz, values):
             {
                 0: pd.Series([pd.NaT] * len(values), dtype="M8[ns]").dt.tz_localize(tz),
                 1: values,
-            },
-            index=pd.Index(list(range(len(values))), dtype="object"),
+            }
         )
         result = concat([first, second], axis=1)
         tm.assert_frame_equal(result, expected)

pandas/tests/series/methods/test_interpolate.py

@@ -169,7 +169,7 @@ def test_interpolate_corners(self, kwargs):
         s = Series([np.nan, np.nan])
         tm.assert_series_equal(s.interpolate(**kwargs), s)
 
-        s = Series([], dtype=object, index=pd.RangeIndex(0)).interpolate()
+        s = Series([], dtype=object).interpolate()
         tm.assert_series_equal(s.interpolate(**kwargs), s)
 
     def test_interpolate_index_values(self):

pandas/tests/series/test_constructors.py

@@ -127,40 +127,37 @@ def test_constructor_empty(self, input_class):
         with tm.assert_produces_warning(DeprecationWarning, check_stacklevel=False):
             empty = Series()
             empty2 = Series(input_class())
-        tm.assert_series_equal(empty, empty2)
-        assert type(empty.index) is Index
+
+        # these are Index() and RangeIndex() which don't compare type equal
+        # but are just .equals
+        tm.assert_series_equal(empty, empty2, check_index_type=False)
 
         # With explicit dtype:
         empty = Series(dtype="float64")
         empty2 = Series(input_class(), dtype="float64")
-        tm.assert_series_equal(empty, empty2)
-        assert type(empty.index) is Index
+        tm.assert_series_equal(empty, empty2, check_index_type=False)
 
         # GH 18515 : with dtype=category:
         empty = Series(dtype="category")
         empty2 = Series(input_class(), dtype="category")
-        tm.assert_series_equal(empty, empty2)
-        assert type(empty.index) is Index
+        tm.assert_series_equal(empty, empty2, check_index_type=False)
 
         if input_class is not list:
             # With index:
             with tm.assert_produces_warning(DeprecationWarning, check_stacklevel=False):
                 empty = Series(index=range(10))
                 empty2 = Series(input_class(), index=range(10))
             tm.assert_series_equal(empty, empty2)
-            assert type(empty.index) is pd.RangeIndex
 
             # With index and dtype float64:
             empty = Series(np.nan, index=range(10))
             empty2 = Series(input_class(), index=range(10), dtype="float64")
             tm.assert_series_equal(empty, empty2)
-            assert type(empty.index) is pd.RangeIndex
 
             # GH 19853 : with empty string, index and dtype str
             empty = Series("", dtype=str, index=range(3))
             empty2 = Series("", index=range(3))
             tm.assert_series_equal(empty, empty2)
-            assert type(empty.index) is pd.RangeIndex
 
     @pytest.mark.parametrize("input_arg", [np.nan, float("nan")])
     def test_constructor_nan(self, input_arg):