code: def test_trimcoef_zero_size(self, dtype):
      for xp in (numpy, cupy):
          a = testing.shaped_random((0,), xp, dtype)
          with pytest.raises(ValueError):
              xp.polynomial.polyutils.trimcoef(a)
  
imports: import unittest
  import numpy
  import pytest
  import cupy
  from cupy import testing
label_desc: Use image node_id 2 for calling the TestTrimcoefInvalid obj's underlying member method code with example usage: obj.test_trimcoef_zero_size(dtype) without return types