code: def test_rankings(self, output_seq_1):
      actual = output_seq_1.rankings(printJson=True)
      assert len(actual["output_tokens"]) == 1
      assert actual["rankings"].shape == (6, 1)
      assert isinstance(int(actual["rankings"][0][0]), int)
  
imports: from ecco import output
  import pytest
  import torch
  import numpy
  from ecco.output import NMF
  import ecco
label_desc: Use image node_id 8 for calling the TestOutput obj's underlying member method code with example usage: obj.test_rankings(output_seq_1) without return types