code: def test_A(self):
      x = self.arange(24)
      x[5:6] = self.masked
      x = x.reshape(2, 3, 4)
  
imports: from __future__ import division, absolute_import, print_function
  import timeit
  from functools import reduce
  import numpy
  from numpy import float_
  import numpy.core.fromnumeric
  from numpy.testing import build_err_msg
label_desc: Use image node_id 13 for calling the ModuleTester obj's underlying member method code with example usage: obj.test_A() without return types