code: def test_tripcolor_color():
      x = [-1, 0, 1, 0]
      y = [0, -1, 0, 1]
      fig, ax = plt.subplots()
      with pytest.raises(
          TypeError, match=r"tripcolor\(\) missing 1 required "
      ):
          ax.tripcolor(x, y)
      with pytest.raises(
          ValueError, match="The length of c must match either"
      ):
          ax.tripcolor(x, y, [1, 2, 3])
      with pytest.raises(
          ValueError,
          match="length of facecolors must match .* triangles",
      ):
          ax.tripcolor(x, y, facecolors=[1, 2, 3, 4])
      with pytest.raises(
          ValueError,
          match="'gouraud' .* at the points.* not at the faces",
      ):
          ax.tripcolor(x, y, facecolors=[1, 2], shading="gouraud")
      with pytest.raises(
          ValueError,
          match="'gouraud' .* at the points.* not at the faces",
      ):
          ax.tripcolor(x, y, [1, 2], shading="gouraud")  # faces
      with pytest.raises(
          TypeError, match="positional.*'c'.*keyword-only.*'facecolors'"
      ):
          ax.tripcolor(x, y, C=[1, 2, 3, 4])
      with pytest.raises(
          TypeError, match="Unexpected positional parameter"
      ):
          ax.tripcolor(x, y, [1, 2], "unused_positional")
  
      # smoke test for valid color specifications (via C or facecolors)
      ax.tripcolor(x, y, [1, 2, 3, 4])  # edges
      ax.tripcolor(x, y, [1, 2, 3, 4], shading="gouraud")  # edges
      ax.tripcolor(x, y, [1, 2])  # faces
      ax.tripcolor(x, y, facecolors=[1, 2])
  
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 10 for calling a global function with example usage: test_tripcolor_color() without return types