pub module impl_test;

struct Vector2 {
    x i32,
    y i32,
}

impl Vector2 {
    pub fn magnitude(*self) i32 {
        self.x * self.x + self.y * self.y
    }
}

pub fn test_inherent_impl() {
    let v = Vector2 { x: 3, y: 4 };
    assert_eq!(v.magnitude(), 25);
}

trait Display {
    fn display(*self) String;
}

impl Display for Vector2 {
    fn display(*self) String {
        format!("({}, {})", self.x, self.y)
    }
}

pub fn test_trait_impl_block() {
    let v = Vector2 { x: 1, y: 2 };
    let s = v.display();
    assert_eq!(s.len() > 0, true);
}

impl Vector2 {
    pub fn add(*self, other Vector2) Vector2 {
        Vector2 {
            x: self.x + other.x,
            y: self.y + other.y,
        }
    }
}

pub fn test_multiple_impls() {
    let a = Vector2 { x: 1, y: 2 };
    let b = Vector2 { x: 3, y: 4 };
    let c = a.add(b);
    assert_eq!(c.x, 4);
    assert_eq!(c.y, 6);
}

pub fn run_tests() {
    test_inherent_impl();
    test_trait_impl_block();
    test_multiple_impls();
}