code: def test_erfcinv(self):
      self.check_unary("erfcinv")
      self.check_unary_random("erfcinv", scale=2, offset=0)
      self.check_unary_boundary("erfcinv", boundary=0)
      self.check_unary_boundary("erfcinv", boundary=2)
  
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 _TestBase obj's underlying member method code with example usage: obj.test_erfcinv() without return types