code: def test_array2string(self):
      a = testing.shaped_arange((2, 3, 4), cupy)
      b = testing.shaped_arange((2, 3, 4), numpy)
      assert cupy.array2string(a) == numpy.array2string(b)
  
file_path: cupy/tests/cupy_tests/io_tests/test_formatting.py
imports: import unittest
  import numpy
  import cupy
  from cupy import testing
label_desc: Use image node_id 3 for calling the TestFormatting obj's underlying member method code with example usage: obj.test_array2string() without return types