Avoid more work in larget_than_int32 tests

Author: mroeschke

pandas/tests/frame/test_stack_unstack.py

@@ -2227,7 +2227,7 @@ def test_unstack_unobserved_keys(self, future_stack):
         tm.assert_frame_equal(recons, df)
 
     @pytest.mark.slow
-    def test_unstack_number_of_levels_larger_than_int32(
+    def test_unstack_number_of_levels_larger_than_int32_warns(
         self, performance_warning, monkeypatch
     ):
         # GH#20601
@@ -2239,6 +2239,9 @@ def __init__(self, *args, **kwargs) -> None:
                 super().__init__(*args, **kwargs)
                 raise Exception("Don't compute final result.")
 
+            def _make_selectors(self) -> None:
+                pass
+
         with monkeypatch.context() as m:
             m.setattr(reshape_lib, "_Unstacker", MockUnstacker)
             df = DataFrame(

pandas/tests/reshape/test_pivot.py

@@ -2144,7 +2144,7 @@ def test_pivot_string_func_vs_func(self, f, f_numpy, data):
         tm.assert_frame_equal(result, expected)
 
     @pytest.mark.slow
-    def test_pivot_number_of_levels_larger_than_int32(
+    def test_pivot_number_of_levels_larger_than_int32_warns(
         self, performance_warning, monkeypatch
     ):
         # GH 20601
@@ -2155,6 +2155,9 @@ def __init__(self, *args, **kwargs) -> None:
                 super().__init__(*args, **kwargs)
                 raise Exception("Don't compute final result.")
 
+            def _make_selectors(self) -> None:
+                pass
+
         with monkeypatch.context() as m:
             m.setattr(reshape_lib, "_Unstacker", MockUnstacker)
             df = DataFrame(