code: def test_delaunay_insufficient_points(x, y):
      with pytest.raises(ValueError):
          mtri.Triangulation(x, y)
  
imports: import numpy
  from numpy.testing import assert_array_equal, assert_array_almost_equal, assert_array_less
  import numpy.ma.testutils
  import pytest
  import matplotlib
  import matplotlib.pyplot
  import matplotlib.tri
  from matplotlib.path import Path
  from matplotlib.testing.decorators import image_comparison, check_figures_equal
label_desc: Use image node_id 7 for calling a global function with example usage: test_delaunay_insufficient_points(x, y) without return types