Test for rejected promise with Jasmine

Question

In my Angular2 app which uses AngularFire2, I have an AuthService which tries to authenticate anonymously with Firebase.

I am trying to write a test that ex

Answer 1

I solved this problem by doing the following:

    describe('should reject promise', () => {

        let resolved: boolean;
        let rejected: boolean;
        let _e: any;

        beforeEach(function (done) {
            resolved = false;
            rejected = false;
            // ensure conditions here are such that myFn() should return a rejected promise
            service.myFn().then(() => {
                resolved = true;
                done();
            }).catch((e) => {
                rejected = true;
                _e = e;
                done();
            });
        })

        it('should reject', () => {
            expect(resolved).toEqual(false);
            expect(rejected).toEqual(true);
            expect(_e.name).toEqual("MyCustomErrorName");
        });
    });