import { afterEach, expect, it, vi } from 'vitest';
import { enableViewTransitions } from '../../src/lib/ui/motion/viewTransition.js';

afterEach(() => vi.unstubAllGlobals());

it('allows navigation to continue when a transition is skipped or superseded', async () => {
    let finish: () => void = () => {};
    const finished = new Promise<void>((resolve) => {
        finish = resolve;
    });
    const complete = Promise.reject(new Error('navigation aborted'));
    vi.stubGlobal('document', {
        startViewTransition: (update: () => Promise<void>) => {
            void update().then(finish);
            return {
                ready: Promise.reject(new DOMException('Skipped transition', 'AbortError')),
                finished
            };
        }
    });
    await enableViewTransitions({ complete });
    await finished;
});

it('continues without animation when the browser cannot start a transition', async () => {
    vi.stubGlobal('document', {
        startViewTransition: () => {
            throw new Error('Unavailable');
        }
    });
    await enableViewTransitions({ complete: Promise.resolve() });
    vi.stubGlobal('document', {});
    expect(enableViewTransitions({ complete: Promise.resolve() })).toBeUndefined();
});