code: def testArgsort(self):
      self._testUnaryOp(math_ops.argsort, np.argsort, "argsort")
  
      # Test stability
      r = np.arange(100)
      a = np.zeros(100)
      np.testing.assert_equal(math_ops.argsort(a, kind="stable"), r)
  
imports: import itertools
  from absl.testing import parameterized
  import numpy
  from six.moves import range
  import tensorflow.compat.v2
  from trax.tf_numpy.numpy_impl import array_ops
  from trax.tf_numpy.numpy_impl import arrays
  from trax.tf_numpy.numpy_impl import math_ops
label_desc: Use image node_id 14 for calling the MathTest obj's underlying member method code with example usage: obj.testArgsort() without return types