67 lines
1.2 KiB
JavaScript
67 lines
1.2 KiB
JavaScript
test("property initialization", () => {
|
|
class A {
|
|
constructor() {
|
|
this.x = 3;
|
|
}
|
|
}
|
|
|
|
expect(new A().x).toBe(3);
|
|
});
|
|
|
|
test("method initialization", () => {
|
|
class A {
|
|
constructor() {
|
|
this.x = () => 10;
|
|
}
|
|
}
|
|
|
|
expect(new A().x()).toBe(10);
|
|
});
|
|
|
|
test("initialize to class method", () => {
|
|
class A {
|
|
constructor() {
|
|
this.x = this.method;
|
|
}
|
|
|
|
method() {
|
|
return 10;
|
|
}
|
|
}
|
|
|
|
expect(new A().x()).toBe(10);
|
|
});
|
|
|
|
test("constructor length affects class length", () => {
|
|
class A {
|
|
constructor() {}
|
|
}
|
|
|
|
expect(A).toHaveLength(0);
|
|
|
|
class B {
|
|
constructor(a, b, c = 2) {}
|
|
}
|
|
|
|
expect(B).toHaveLength(2);
|
|
});
|
|
|
|
test.skip("must be invoked with 'new'", () => {
|
|
class A {
|
|
constructor() {}
|
|
}
|
|
|
|
expect(() => {
|
|
A();
|
|
}).toThrow(TypeError); // FIXME: Add message when this test works
|
|
|
|
expect(() => {
|
|
A.prototype.constructor();
|
|
}).toThrow(TypeError); // FIXME: Add message when this test works
|
|
});
|
|
|
|
test("implicit constructor", () => {
|
|
class A {}
|
|
|
|
expect(new A()).toBeInstanceOf(A);
|
|
});
|