code: def test_pad_shrink_leaves_mask(self):
      a = ShapeTracker.from_shape((10, 10))
      a = a.pad(((0, 2), (0, 2)))
      a = a.shrink(((0, 10), (0, 11)))
      assert len(a.views) == 1 and a.views[-1].mask is not None
  
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 2 for calling the TestShapeTrackerBasics obj's underlying member method code with example usage: obj.test_pad_shrink_leaves_mask() without return types