code: def test_sobel_h_mask():
      """Horizontal Sobel on a masked array should be zero."""
      result = filters.sobel_h(
          np.random.uniform(size=(10, 10)),
          np.zeros((10, 10), dtype=bool),
      )
      assert np.all(result == 0)
  
imports: import numpy
  import pytest
  from numpy.testing import assert_, assert_allclose, assert_array_almost_equal
  from skimage import data, filters
  from skimage._shared.utils import _supported_float_type
  from skimage.filters.edges import _mask_filter_result
label_desc: Use image node_id 10 for calling a global function with example usage: test_sobel_h_mask() without return types