code: def test_plus_real1(self):
      st = MultiShapeTracker([ShapeTracker.from_shape((15, 9))])
      st.shrink(((0, 15), (6, 9)))
      backup = st.sts[0]
      st.sts.append(ShapeTracker.from_shape(backup.shape))
      st.reshape((45,))
      st.stride((4,))
      st.reshape((4, 3))
      assert st_equal(backup + st.sts[1], st.sts[0])
  
imports: import unittest
  from typing import List
  from tinygrad.helpers import prod
  from tinygrad.shape.view import View
  from tinygrad.shape.shapetracker import ShapeTracker
  from tinygrad.shape.symbolic import Variable, sym_infer
label_desc: Use image node_id 3 for calling the TestShapeTrackerAdd obj's underlying member method code with example usage: obj.test_plus_real1() without return types