Function test_values

crates/plotlars-core/src/components/header.rs:119–123

()

    #[test]
    fn test_values() {
        let header = Header::new().values(vec!["A", "B"]);
        let values = header.values.unwrap();
        assert_eq!(values, vec!["A".to_string(), "B".to_string()]);
    }

    #[test]
    fn test_height() {