code: def test_scalar(self, function, args, expected):
      self._test_scalar(function, args, expected)
  
imports: import numpy
  import pytest
  import cupy
  from cupy import testing
  import cupyx.scipy.special
label_desc: Use image node_id 3 for calling the TestTwoArgumentDistribution obj's underlying member method code with example usage: obj.test_scalar(function, args, expected) without return types