code: def test_1darray(self, dtype):
      for xp in (numpy, cupy):
          a = testing.shaped_arange((5,), xp, dtype)
          val = self._compute_val(xp)
          with pytest.raises(ValueError):
              xp.fill_diagonal(a, val=val, wrap=self.wrap)
  
imports: import unittest
  import numpy
  import pytest
  import cupy
  from cupy import testing
label_desc: Use image node_id 4 for calling the TestFillDiagonal obj's underlying member method code with example usage: obj.test_1darray(dtype) without return types