code: def test_fillvalue_type(self):
      # from #3703; test that interpolator object construction succeeds
      values = cp.ones((10, 20, 30), dtype=">f4")
      points = [cp.arange(n) for n in values.shape]
      # xi = [(1, 1, 1)]
      RegularGridInterpolator(points, values)
      RegularGridInterpolator(points, values, fill_value=0.0)
  
imports: import pytest
  import cupy
  from cupy.testing import assert_allclose, assert_array_equal, assert_array_almost_equal
  from cupy_backends.cuda.api import runtime
  from pytest import raises
  from cupyx.scipy.interpolate import RegularGridInterpolator, interpn
label_desc: Use image node_id 16 for calling the TestRegularGridInterpolator obj's underlying member method code with example usage: obj.test_fillvalue_type() without return types