'test with colors set to a 3d object array of strings'

@image_comparison(baseline_images=['voxels-named-colors'], extensions=['png'], remove_text=True)
def test_named_colors(self):

    (fig, ax) = plt.subplots(subplot_kw={'projection': '3d'})
    (x, y, z) = np.indices((10, 10, 10))
    voxels = ((x == y) | (y == z))
    voxels = (voxels & (~ (((x * y) * z) < 1)))
    colors = np.zeros((10, 10, 10), dtype=np.object_)
    colors.fill('C0')
    colors[((x < 5) & (y < 5))] = '0.25'
    colors[((x + z) < 10)] = 'cyan'
    ax.voxels(voxels, facecolors=colors)
