Jasmine - Throwing errors

ErrorThrowing.js

describe('Throwing errors', function() {
    var user = {
        getUser: function(id) {
            // Do something
        }
    };
    
    it('Should throw a custom error message', function() {
        spyOn(user, 'getUser').and.throwError('No user ID specified');

        expect(user.getUser).toThrowError('No user ID specified');
    });
    
    it('Should throw a custom error message - example 2', function() {
        spyOn(user, 'getUser').and.throwError('Invalid user ID');

        expect(function() { user.getUser('test') }).toThrowError('Invalid user ID');
    });
});