code: def test_shape(self):
      assert self.m.shape == (3, 4)
  
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 5 for calling the TestDiaMatrix obj's underlying member method code with example usage: obj.test_shape() without return types