Function show_errors_works

src/plot.rs:1286–1293

()

    #[test]
    fn show_errors_works() {
        const WRONG: usize = 0;
        let mut plot = Plot::new();
        plot.set_show_errors(true);
        plot.set_subplot(1, 1, WRONG);
        let path = Path::new(OUT_DIR).join("show_errors_works.svg");
        assert_eq!(plot.save(&path).err(), Some("python3 failed; please see the log file"));
    }

    #[test]
    fn subplot_3d_works() {