code: def test_value_accross_modules(self):
      # Mocking module import by invoking the code but not in our globals().
      exec(
          'from tinygrad.helpers import ContextVar;C = ContextVar("C", 13)',
          {},
      )  # pylint:disable=exec-used
      # It should not matter that the first creation was in another module.
      C = ContextVar("C", 0)
      self.assertEqual(C.value, 13)
  
imports: import unittest
  from PIL import Image
  from tinygrad.helpers import Context, ContextVar, merge_dicts, strip_parens, prod, round_up, fetch, fully_flatten, from_mv, to_mv
  from tinygrad.shape.symbolic import Variable, NumNode
label_desc: Use image node_id 6 for calling the TestContextVars obj's underlying member method code with example usage: obj.test_value_accross_modules() without return types