import {
    ElementRef,
} from '@angular/core';

const mockScrollIntoView = jest.fn();
jest.mock('scroll-into-view', () => mockScrollIntoView);

import {
    ScrollIntoViewOnInitDirective,
} from './scroll-into-view-on-init.directive';

const initScrollIntoViewOnInitDirective = (
    elementRef: ElementRef,
) => {
    return new ScrollIntoViewOnInitDirective(
        elementRef,
    );
};

describe('ngOnInit', () => {
    test('Calls scrollIntoView on elementRef', () => {
        const elementRef = {
            nativeElement: {},
        } as ElementRef;
        mockScrollIntoView.mockReset();
        const scrollIntoViewOnInit =
            initScrollIntoViewOnInitDirective(elementRef);

        scrollIntoViewOnInit.ngOnInit();

        expect(mockScrollIntoView)
            .toHaveBeenCalledWith(elementRef.nativeElement);
    });
});