code: def test_var_vals_offset(self):
      x = Variable("x", 1, 100).bind(3)
      st = ShapeTracker.from_shape((4, 3)).shrink(((x, x + 1), (0, 3)))
      assert st.views[-1].offset == x * 3
      assert st.var_vals == {Variable("x", 1, 100): 3}
  
imports: import unittest
  from tinygrad.shape.shapetracker import ShapeTracker, View
  from tinygrad.shape.symbolic import Variable, NumNode
  from tinygrad.tensor import Tensor
label_desc: Use image node_id 3 for calling the TestSymbolicVarVals obj's underlying member method code with example usage: obj.test_var_vals_offset() without return types