TST/CLN: Prepare moving tests out of groupby/test_allowlist (#52851)

pandas/tests/groupby/test_allowlist.py

@@ -3,72 +3,38 @@
 Do not add tests here!
 """
 
-from string import ascii_lowercase
-
-import numpy as np
 import pytest
 
 from pandas import (
     DataFrame,
-    Series,
     date_range,
 )
 import pandas._testing as tm
 
-AGG_FUNCTIONS = [
-    "sum",
-    "prod",
-    "min",
-    "max",
-    "median",
-    "mean",
-    "skew",
-    "std",
-    "var",
-    "sem",
-]
-AGG_FUNCTIONS_WITH_SKIPNA = ["skew"]
-
-
-@pytest.fixture
-def df():
-    return DataFrame(
-        {
-            "A": ["foo", "bar", "foo", "bar", "foo", "bar", "foo", "foo"],
-            "B": ["one", "one", "two", "three", "two", "two", "one", "three"],
-            "C": np.random.randn(8),
-            "D": np.random.randn(8),
-        }
-    )
-
-
-@pytest.fixture
-def df_letters():
-    letters = np.array(list(ascii_lowercase))
-    N = 10
-    random_letters = letters.take(np.random.randint(0, 26, N))
-    df = DataFrame(
-        {
-            "floats": N / 10 * Series(np.random.random(N)),
-            "letters": Series(random_letters),
-        }
-    )
-    return df
-
 
-@pytest.fixture
-def raw_frame():
-    return DataFrame([0])
-
-
-@pytest.mark.parametrize("op", AGG_FUNCTIONS)
+@pytest.mark.parametrize(
+    "op",
+    [
+        "sum",
+        "prod",
+        "min",
+        "max",
+        "median",
+        "mean",
+        "skew",
+        "std",
+        "var",
+        "sem",
+    ],
+)
 @pytest.mark.parametrize("axis", [0, 1])
 @pytest.mark.parametrize("skipna", [True, False])
 @pytest.mark.parametrize("sort", [True, False])
-def test_regression_allowlist_methods(raw_frame, op, axis, skipna, sort):
+def test_regression_allowlist_methods(op, axis, skipna, sort):
     # GH6944
     # GH 17537
     # explicitly test the allowlist methods
+    raw_frame = DataFrame([0])
     if axis == 0:
         frame = raw_frame
         msg = "The 'axis' keyword in DataFrame.groupby is deprecated and will be"
@@ -79,7 +45,8 @@ def test_regression_allowlist_methods(raw_frame, op, axis, skipna, sort):
     with tm.assert_produces_warning(FutureWarning, match=msg):
         grouped = frame.groupby(level=0, axis=axis, sort=sort)
 
-    if op in AGG_FUNCTIONS_WITH_SKIPNA:
+    if op == "skew":
+        # skew has skipna
         result = getattr(grouped, op)(skipna=skipna)
         expected = frame.groupby(level=0).apply(
             lambda h: getattr(h, op)(axis=axis, skipna=skipna)