code: def testNonDefaultCurrent(self):
      with self.assertRaises(AssertionError):
          MyContext.current()
  
      ctx = MyContext()
      self.assertEqual(MyContext.current(value=ctx), ctx)
  
      self.assertIsNone(MyContext.current(required=False))
  
file_path: pytorch/caffe2/python/context_test.py
imports: from caffe2.python import context, test_util
  from threading import Thread
label_desc: Use image node_id 4 for calling the TestContext obj's underlying member method code with example usage: obj.testNonDefaultCurrent() without return types