class_docstr: Run a set of generic tests to verify that self.func acts like a
  reduction operation.
  
  Specifically, this class checks axis=... and keepdims=... parameters.
  To check the out=... parameter, see the _GenericHasOutTestMixin class below.
  
  To use: subclass, define self.func and self.allowed_axes.
code: def test_axis_empty_generic(self, func):
      if func in fails_empty_tuple:
          raise SkipTest("func(..., axis=()) is not valid")
  
      a = np.array([[0, 0, 1], [1, 0, 1]])
      assert_array_equal(
          func(a, axis=()), func(np.expand_dims(a, axis=0), axis=0)
      )
  
imports: from unittest import skipIf, SkipTest
  import numpy
  import pytest
  from pytest import raises
  from torch.testing._internal.common_utils import instantiate_parametrized_tests, parametrize, run_tests, TEST_WITH_TORCHDYNAMO, TestCase, xpassIfTorchDynamo
label_desc: Use image node_id 3 for calling the TestGenericReductions obj's underlying member method code with example usage: obj.test_axis_empty_generic(func) without return types