code: def test_add_masked(self):
      a = Tensor([1, 1]).pad(((0, 2),))
      b = Tensor([1, 1]).pad(((0, 2),))
      c = a + b
      # assert c.lazydata.st.views[0].mask is not None
      ret = c.data()
      assert ret.tolist() == [2.0, 2.0, 0.0, 0.0]
  
imports: import unittest
  from tinygrad.tensor import Tensor
label_desc: Use image node_id 3 for calling the TestMaskedShapeTracker obj's underlying member method code with example usage: obj.test_add_masked() without return types