code: def test_min_nan(self, xp, dtype):
      if _acc.ACCELERATOR_CUTENSOR in _acc.get_routine_accelerators():
          pytest.skip()
      a = xp.array([float("nan"), 1, -1], dtype, order=self.order)
      return a.min()
  
imports: import unittest
  import numpy
  import pytest
  import cupy
  import cupy._core._accelerator
  from cupy._core import _cub_reduction
  from cupy import testing
label_desc: Use image node_id 20 for calling the TestArrayReduction obj's underlying member method code with example usage: obj.test_min_nan(xp, dtype) and returns: a