code: def test_GetFunctionTestMixin_class():
      class TestCustomGetFail(GetFunctionTestMixin):
          get = staticmethod(lambda x, y: 1)
  
      custom_testget = TestCustomGetFail()
      pytest.raises(AssertionError, custom_testget.test_get)
  
      class TestCustomGetPass(GetFunctionTestMixin):
          get = staticmethod(get)
  
      custom_testget = TestCustomGetPass()
      custom_testget.test_get()
  
imports: from __future__ import annotations
  import pickle
  from collections import namedtuple
  import pytest
  from dask.core import flatten, get, get_dependencies, get_deps, getcycle, has_tasks, ishashable, iskey, istask, literal, preorder_traversal, quote, subs, validate_key
  from dask.utils_test import GetFunctionTestMixin, add, inc
label_desc: Use image node_id 9 for calling a global function with example usage: test_GetFunctionTestMixin_class() without return types