code: def test_offsets(self):
      if (
          runtime.is_hip
          and self.dtype == numpy.float32
          and driver.get_build_version() == 400
      ):
          pytest.xfail("generated wrong result -- may be buggy?")
      assert self.m.offsets.dtype == numpy.int32
      testing.assert_array_equal(
          self.m.offsets, cupy.array([0, -1], self.dtype)
      )
  
imports: import pickle
  import unittest
  import numpy
  import pytest
  import cupy
  from cupy import testing
  from cupy.cuda import driver
  from cupy.cuda import runtime
  from cupyx.scipy import sparse
label_desc: Use image node_id 4 for calling the TestDiaMatrix obj's underlying member method code with example usage: obj.test_offsets() without return types