Added items

mist-test/src/items/impl_test.mist

@@ -0,0 +1,56 @@
+pub module impl_test;
+
+struct Vector2 {
+    x i32,
+    y i32,
+}
+
+impl Vector2 {
+    pub fn i32 magnitude(*self) {
+        self.x * self.x + self.y * self.y
+    }
+}
+
+pub fn void test_inherent_impl() {
+    let v = Vector2 { x: 3, y: 4 };
+    assert_eq!(v.magnitude(), 25);
+}
+
+trait Display {
+    fn String display(*self);
+}
+
+impl Display for Vector2 {
+    fn String display(*self) {
+        format!("({}, {})", self.x, self.y)
+    }
+}
+
+pub fn void 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 Vector2 add(*self, other Vector2) {
+        Vector2 {
+            x: self.x + other.x,
+            y: self.y + other.y,
+        }
+    }
+}
+
+pub fn void 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 void run_tests() {
+    test_inherent_impl();
+    test_trait_impl_block();
+    test_multiple_impls();
+}