code: def test_tril_array_like(self, xp):
      return xp.tril([[1, 2], [3, 4]])
  
imports: import unittest
  import numpy
  import pytest
  import cupy
  from cupy import testing
label_desc: Use image node_id 2 for calling the TestTriLowerAndUpper obj's underlying member method code with example usage: obj.test_tril_array_like(xp) and returns: xp