code: def testDoWhileLoopWithStep(self):
      step = control.Do("count", self.cnt_net_)
      self.DoWhileLoopTest(step)
      self.DoWhileLoopTest([self.idle_net_, step])
  
imports: from caffe2.python import control, core, test_util, workspace
  import logging
label_desc: Use image node_id 16 for calling the TestControl obj's underlying member method code with example usage: obj.testDoWhileLoopWithStep() without return types