def METHOD_NAME(self):
    vectorfield = VectorField([(0, 0, 0, 1, '#000000'), (0, 1, 0, 1,'#FF0000'), (0, 2, 0, 1,'#00FF00')],
                              vdims=['A', 'M', 'color']).opts(color='color')
    plot = mpl_renderer.get_plot(vectorfield)
    artist = plot.handles['artist']
    self.assertEqual(artist.get_facecolors(), np.array([
        [0, 0, 0, 1],
        [1, 0, 0, 1],
        [0, 1, 0, 1]
    ]))