code: def test_desktop_sender(self):
      @desktop_sender(title="Test Desktop")
      def train():
          import time
  
          time.sleep(5)
          return {"loss": 1}
  
      self.assertEqual(train(), {"loss": 1})
  
imports: import unittest
  from knockknock.desktop_sender import desktop_sender
label_desc: Use image node_id 1 for calling the TestSenders obj's underlying member method code with example usage: obj.test_desktop_sender() and returns: dict