code: def test_who_empty(self, capsys):
      cupy.who()
      out, err = capsys.readouterr()
      lines = out.split("\n")
      assert len(lines) == 3
      assert lines[1] == "Upper bound on total bytes  =       0"
  
imports: import cupy
label_desc: Use image node_id 1 for calling the TestWho obj's underlying member method code with example usage: obj.test_who_empty(capsys) without return types