code: def test_defaults(self):
      ctx = context.RequestContext()
      self.assertIsInstance(ctx.auth, auth_lib.AuthContext)
      self.assertEqual(ctx.remote_ip, None)
      self.assertEqual(ctx.x_forwarded_for, ())
      self.assertEqual(ctx.client_feature_flags, {})
  
file_path: tensorboard/tensorboard/context_test.py
imports: import ipaddress
  from tensorboard import auth
  from tensorboard import context
  from tensorboard import test
label_desc: Use image node_id 1 for calling the RequestContextTest obj's underlying member method code with example usage: obj.test_defaults() without return types