code: def test_symbolic_st(self):
      x = Variable("x", 1, 100)
      st = ShapeTracker.from_shape((x, 3))
      assert st.shape == (x, 3)
      assert st.real_strides() == (3, 1)
  
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 1 for calling the TestSymbolic obj's underlying member method code with example usage: obj.test_symbolic_st() without return types