Function arrow_woks

src/canvas.rs:1451–1458

()

    #[test]
    fn arrow_woks() {
        let mut canvas = Canvas::new();
        canvas.draw_arrow(0.0, 0.0, 1.0, 1.0);
        let b: &str =
            "p=pat.FancyArrowPatch((0,0),(1,1),shrinkA=0,shrinkB=0,path_effects=[pff.Stroke(joinstyle='miter')],edgecolor='#427ce5')\n\
             plt.gca().add_patch(p)\n";
        assert_eq!(canvas.buffer, b);
    }

    #[test]
    fn circle_works() {