once_test.TestOnce
  ✅ test_closure_gc
  ✅ test_counter_works
  ✅ test_different_args_same_result
  ✅ test_different_fn_do_not_deadlock
  ✅ test_function_signature_preserved
  ✅ test_lock_bypass
  ✅ test_once_not_allowed_on_method
  ✅ test_once_per_class
  ✅ test_once_per_class_classmethod
  ✅ test_once_per_class_not_allowed_on_classmethod
  ✅ test_once_per_class_not_allowed_on_staticmethod
  ✅ test_once_per_class_staticmethod
  ✅ test_once_per_instance
  ✅ test_once_per_instance_do_not_block_each_other
  ✅ test_once_per_instance_not_allowed_on_function
  ✅ test_threaded_multiple_functions
  ✅ test_threaded_single_function