code: def test_isfinite(xp, device, input, dtype):
      a = xp.array(input.astype(dtype))
      return xp.isfinite(a)
  
imports: import chainer
  import numpy
  import pytest
  import chainerx
  import chainerx.testing
  from chainerx_tests import array_utils
  from chainerx_tests import dtype_utils
  from chainerx_tests import op_utils
label_desc: Use image node_id 8 for calling a global function with example usage: test_isfinite(xp, device, input, dtype) and returns: xp