#[derive(Debug, Eq, PartialEq)]
pub struct Variable {
    pub id: String,
    pub initial_value: String,
}

impl From<String> for Variable {
    fn from(string: String) -> Variable {
        let id_value: Vec<&str> = string.split('\n').collect();
        let id = id_value[0].replace("VAR ", "").to_string();
        let initial_value = id_value[1].to_string();

        Variable { id, initial_value }
    }
}

impl ToString for Variable {
    #[inline]
    fn to_string(&self) -> String {
        format!("VAR {}\n{}", self.id, self.initial_value)
    }
}

#[test]
fn test_variable_from_string() {
    assert_eq!(
        Variable::from("VAR a\n42".to_string()),
        Variable { id: "a".to_string(), initial_value: "42".to_string()}
    );
}

#[test]
fn test_variable_to_string() {
    let output = Variable { id: "c".to_string(), initial_value: "57".to_string() }.to_string();
    let expected = "VAR c\n57".to_string();
    assert_eq!(output, expected);
}