code: def test_types(self, xp, ufunc):
      types = getattr(xp, ufunc).types
      if xp == numpy:
          assert isinstance(types, list)
          types = list(
              dict.fromkeys(  # remove dups: numpy/numpy#7897
                  sig
                  for sig in types
                  # CuPy does not support the following dtypes:
                  # (c)longdouble, datetime, timedelta, and object.
                  if not any(t in sig for t in "GgMmO")
              )
          )
      return types
  
imports: import numpy
  import pytest
  import cupy
  from cupy import testing
label_desc: Use image node_id 1 for calling the TestUfunc obj's underlying member method code with example usage: obj.test_types(xp, ufunc) and returns: types