code: def test_add_add_simplify(self):
      expr = (
          "#Add",
          (3.0,),
          ("#Add", (4.0,), (5.0,), ("#Add", (6.0,))),
      )
      did_something, new_expr = add_add_simplify(expr)
      self.assertTrue(did_something)
      self.assertEqual(
          new_expr, ("#Add", (3.0,), (4.0,), (5.0,), (6.0,))
      )
      did_something, new_expr = add_add_simplify(new_expr)
      self.assertFalse(did_something)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import edward
  import numpy
  import tensorflow
  from edward.inferences.conjugacy.simplify import *
  from edward.inferences.conjugacy.simplify import _mul_n
label_desc: Use image node_id 11 for calling the test_simplify_class obj's underlying member method code with example usage: obj.test_add_add_simplify() without return types