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|
test("method inheritance", () => {
class Parent {
method() {
return 3;
}
}
class Child extends Parent {}
const p = new Parent();
const c = new Child();
expect(p.method()).toBe(3);
expect(c.method()).toBe(3);
});
test("method overriding", () => {
class Parent {
method() {
return 3;
}
}
class Child extends Parent {
method() {
return 10;
}
}
const p = new Parent();
const c = new Child();
expect(p.method()).toBe(3);
expect(c.method()).toBe(10);
});
test("parent method reference with super", () => {
class Parent {
method() {
return 3;
}
}
class Child extends Parent {
method() {
return super.method() * 2;
}
}
const p = new Parent();
const c = new Child();
expect(p.method()).toBe(3);
expect(c.method()).toBe(6);
});
test("child class access to parent class initialized properties", () => {
class Parent {
constructor() {
this.x = 3;
}
}
class Child extends Parent {}
const p = new Parent();
const c = new Child();
expect(p.x).toBe(3);
expect(c.x).toBe(3);
});
test("child class modification of parent class properties", () => {
class Parent {
constructor() {
this.x = 3;
}
}
class Child extends Parent {
change() {
this.x = 10;
}
}
const p = new Parent();
const c = new Child();
expect(p.x).toBe(3);
expect(c.x).toBe(3);
c.change();
expect(c.x).toBe(10);
});
test("inheritance and hasOwnProperty", () => {
class Parent {
constructor() {
this.x = 3;
}
}
class Child extends Parent {
method() {
this.y = 10;
}
}
const p = new Parent();
const c = new Child();
expect(p.hasOwnProperty("x")).toBeTrue();
expect(p.hasOwnProperty("y")).toBeFalse();
expect(c.hasOwnProperty("x")).toBeTrue();
expect(c.hasOwnProperty("y")).toBeFalse();
c.method();
expect(c.hasOwnProperty("x")).toBeTrue();
expect(c.hasOwnProperty("y")).toBeTrue();
});
test("super constructor call from child class with argument", () => {
class Parent {
constructor(x) {
this.x = x;
}
}
class Child extends Parent {
constructor() {
super(10);
}
}
const p = new Parent(3);
const c = new Child(3);
expect(p.x).toBe(3);
expect(c.x).toBe(10);
});
test("advanced 'extends' RHS", () => {
const foo = {
bar() {
return {
baz() {
return function () {
return function () {
return { quux: Number };
};
};
},
};
},
};
class Foo extends foo.bar()["baz"]()`qux`().quux {}
expect(new Foo()).toBeInstanceOf(Number);
});
test("issue #7045, super constructor call from child class in catch {}", () => {
class Parent {
constructor(x) {
this.x = x;
}
}
class Child extends Parent {
constructor() {
try {
throw new Error("Error in Child constructor");
} catch (e) {
super(e.message);
}
}
}
const c = new Child();
expect(c.x).toBe("Error in Child constructor");
});
test("Issue #7044, super property access before super() call", () => {
class Foo {
constructor() {
super.bar;
}
}
new Foo();
});
test("Issue #8574, super property access before super() call", () => {
var hit = false;
class Foo extends Object {
constructor() {
expect(() => {
const foo = super.bar();
}).toThrowWithMessage(ReferenceError, "|this| has not been initialized");
hit = true;
}
}
// Note: We catch two exceptions here.
expect(() => {
new Foo();
}).toThrowWithMessage(ReferenceError, "|this| has not been initialized");
expect(hit).toBeTrue();
});
|
