code: def test_erfcinv_behavior(self, dtype):
      a = cupy.empty((1,), dtype=dtype)
  
      a[:] = 2.0 + 1e-6
      a = cupyx.scipy.special.erfcinv(a)
      assert cupy.isnan(a)
      a[:] = 0.0 - 1e-6
      a = cupyx.scipy.special.erfcinv(a)
      assert cupy.isnan(a)
      a[:] = 0.0
      a = cupyx.scipy.special.erfcinv(a)
      assert numpy.isposinf(cupy.asnumpy(a))
      a[:] = 2.0
      a = cupyx.scipy.special.erfcinv(a)
      assert numpy.isneginf(cupy.asnumpy(a))
  
imports: import unittest
  import numpy
  import cupy
  from cupy import testing
  import cupyx.scipy.special
label_desc: Use image node_id 5 for calling the TestSpecial obj's underlying member method code with example usage: obj.test_erfcinv_behavior(dtype) without return types