code: def test_client_executor(self):
      executor = self.client.executor()
      assert isinstance(executor.view, LoadBalancedView)
      f = executor.submit(lambda x: 2 * x, 5)
      r = f.result()
      assert r == 10
  
file_path: ipyparallel/ipyparallel/tests/test_executor.py
imports: import time
  from ipyparallel.client.view import LazyMapIterator, LoadBalancedView
  from .clienttest import ClusterTestCase
label_desc: Use image node_id 1 for calling the TestExecutor obj's underlying member method code with example usage: obj.test_client_executor() without return types