code: def test_sinc_zero(self, dtype):
      a = cupy.sinc(cupy.zeros(1, dtype=dtype))
      testing.assert_array_equal(a, cupy.ones(1, dtype=dtype))
  
imports: import unittest
  import cupy
  from cupy import testing
label_desc: Use image node_id 3 for calling the TestSpecial obj's underlying member method code with example usage: obj.test_sinc_zero(dtype) without return types