code: def test_determinant_zero():
      img = mahotas.imread(
          path.join(
              path.abspath(path.dirname(__file__)),
              "data",
              "determinant_zero.png",
          )
      )
      points = surf(img, threshold=0.0)
      assert type(points) == np.ndarray
  
imports: import mahotas
  import numpy
  from mahotas.features.surf import surf
  from os import path
label_desc: Use image node_id 1 for calling a global function with example usage: test_determinant_zero() without return types