code: def test_warn_rcond(self, xp, dtype):
      a = testing.shaped_random((3, 3), xp, dtype)
      b = testing.shaped_random((3,), xp, dtype)
      with testing.assert_warns(FutureWarning):
          return xp.linalg.lstsq(a, b)
  
imports: import unittest
  import numpy
  import pytest
  import cupy
  from cupy import testing
  from cupy.testing import _condition
  import cupyx
  from cupy.cublas import get_batched_gesv_limit, set_batched_gesv_limit
label_desc: Use image node_id 6 for calling the TestLstsq obj's underlying member method code with example usage: obj.test_warn_rcond(xp, dtype) and returns: xp