code: def test_simplify_is_correct(self):
      multiv = ShapeTracker(
          views=(
              View(
                  shape=(15, 3),
                  strides=(9, 1),
                  offset=6,
                  mask=None,
                  contiguous=False,
              ),
              View(
                  shape=(4, 3),
                  strides=(12, 4),
                  offset=0,
                  mask=None,
                  contiguous=False,
              ),
          )
      )
      assert st_equal(multiv, multiv.simplify())
  
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 4 for calling the TestShapeTrackerBasics obj's underlying member method code with example usage: obj.test_simplify_is_correct() without return types