133 lines
2.5 KiB
JavaScript
133 lines
2.5 KiB
JavaScript
test("method inheritance", () => {
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class Parent {
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method() {
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return 3;
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}
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}
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class Child extends Parent {}
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const p = new Parent();
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const c = new Child();
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expect(p.method()).toBe(3);
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expect(c.method()).toBe(3);
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});
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test("method overriding", () => {
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class Parent {
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method() {
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return 3;
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}
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}
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class Child extends Parent {
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method() {
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return 10;
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}
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}
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const p = new Parent();
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const c = new Child();
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expect(p.method()).toBe(3);
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expect(c.method()).toBe(10);
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});
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test("parent method reference with super", () => {
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class Parent {
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method() {
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return 3;
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}
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}
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class Child extends Parent {
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method() {
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return super.method() * 2;
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}
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}
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const p = new Parent();
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const c = new Child();
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expect(p.method()).toBe(3);
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expect(c.method()).toBe(6);
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});
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test("child class access to parent class initialized properties", () => {
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class Parent {
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constructor() {
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this.x = 3;
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}
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}
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class Child extends Parent {}
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const p = new Parent();
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const c = new Child();
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expect(p.x).toBe(3);
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expect(c.x).toBe(3);
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});
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test("child class modification of parent class properties", () => {
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class Parent {
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constructor() {
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this.x = 3;
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}
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}
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class Child extends Parent {
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change() {
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this.x = 10;
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}
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}
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const p = new Parent();
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const c = new Child();
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expect(p.x).toBe(3);
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expect(c.x).toBe(3);
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c.change();
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expect(c.x).toBe(10);
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});
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test("inheritance and hasOwnProperty", () => {
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class Parent {
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constructor() {
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this.x = 3;
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}
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}
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class Child extends Parent {
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method() {
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this.y = 10;
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}
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}
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const p = new Parent();
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const c = new Child();
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expect(p.hasOwnProperty("x")).toBeTrue();
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expect(p.hasOwnProperty("y")).toBeFalse();
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expect(c.hasOwnProperty("x")).toBeTrue();
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expect(c.hasOwnProperty("y")).toBeFalse();
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c.method();
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expect(c.hasOwnProperty("x")).toBeTrue();
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expect(c.hasOwnProperty("y")).toBeTrue();
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});
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test("super constructor call from child class with argument", () => {
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class Parent {
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constructor(x) {
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this.x = x;
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}
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}
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class Child extends Parent {
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constructor() {
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super(10);
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}
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}
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const p = new Parent(3);
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const c = new Child(3);
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expect(p.x).toBe(3);
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expect(c.x).toBe(10);
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});
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