code: def test_invalid_input():
      with pytest.raises(ValueError):
          find_contours(r, 0.5, "foo", "bar")
      with pytest.raises(ValueError):
          find_contours(r[..., None], 0.5)
  
file_path: scikit-image/skimage/measure/tests/test_find_contours.py
imports: import numpy
  from skimage.measure import find_contours
  from skimage._shared.testing import assert_array_equal
  import pytest
label_desc: Use image node_id 8 for calling a global function with example usage: test_invalid_input() without return types