code: def test_unknown_param_to_context(self):
      with self.assertRaises(KeyError):
          with Context(SOMETHING_ELSE=1):
              pass
  
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 9 for calling the TestContextVars obj's underlying member method code with example usage: obj.test_unknown_param_to_context() without return types