code: def test_nanmin_nan(self, xp, dtype):
      a = xp.array([float("nan"), 1, -1], dtype)
      with warnings.catch_warnings():
          return xp.nanmin(a)
  
imports: import warnings
  import numpy
  import pytest
  import cupy
  import cupy._core._accelerator
  from cupy import cuda
  from cupy import testing
label_desc: Use image node_id 13 for calling the TestOrder obj's underlying member method code with example usage: obj.test_nanmin_nan(xp, dtype) and returns: xp