code: def test_client_logged_in_user(worker):
      guest_client = worker.guest_client
      assert guest_client.logged_in_user == ""
  
      client = guest_client.login(
          email="info@openmined.org", password="changethis"
      )
      assert client.logged_in_user == "info@openmined.org"
  
      client.register(
          name="sheldon",
          email="sheldon@caltech.edu",
          password="bazinga",
          password_verify="bazinga",
      )
  
      client = client.login(
          email="sheldon@caltech.edu", password="bazinga"
      )
  
      assert client.logged_in_user == "sheldon@caltech.edu"
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_client_logged_in_user(worker) without return types