96 lines
4.0 KiB
TypeScript
96 lines
4.0 KiB
TypeScript
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
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import { createElement } from "react";
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import { renderToStaticMarkup } from "react-dom/server";
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import { FeaturedCarousel } from "@/components/FeaturedCarousel";
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import { FEATURED_INTERVAL_MS, featuredSlot, startFeaturedAutoplay } from "@/components/featured-carousel-model";
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import type { DiscoverExpert } from "@/lib/discover";
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const expert = (i: number): DiscoverExpert => ({
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id: i, slug: `e${i}`, displayName: `Expert ${i}`, byline: `Byline ${i}`, pictureUrl: i % 2 ? `https://x/${i}.jpg` : null,
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rating: 4.5, reviewsCount: i, available: true, location: { city: null, country: null },
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});
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const experts = (n: number) => Array.from({ length: n }, (_, i) => expert(i + 1));
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describe("featuredSlot", () => {
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it("places items by offset from the current index, wrapping round", () => {
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const slots = Array.from({ length: 8 }, (_, i) => featuredSlot(i, 0, 8));
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expect(slots).toEqual(["c0", "r1", "r2", "r3", "r3", "l3", "l2", "l1"]);
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expect(featuredSlot(0, 7, 8)).toBe("r1");
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expect(featuredSlot(6, 7, 8)).toBe("l1");
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});
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it("degrades with one or two experts: no empty neighbors", () => {
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expect(featuredSlot(0, 0, 1)).toBe("c0");
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expect([featuredSlot(0, 0, 2), featuredSlot(1, 0, 2)]).toEqual(["c0", "r1"]);
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expect([featuredSlot(0, 1, 2), featuredSlot(1, 1, 2)]).toEqual(["r1", "c0"]);
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expect([0, 1, 2].map((i) => featuredSlot(i, 0, 3))).toEqual(["c0", "r1", "l1"]);
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});
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});
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describe("startFeaturedAutoplay", () => {
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beforeEach(() => { vi.useFakeTimers(); });
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afterEach(() => { vi.useRealTimers(); });
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it("advances every 2.8s and wraps to the start", () => {
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const seen: number[] = [];
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const ctl = startFeaturedAutoplay({ count: 3, onChange: (i) => seen.push(i) });
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expect(FEATURED_INTERVAL_MS).toBe(2800);
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vi.advanceTimersByTime(2799);
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expect(seen).toEqual([]);
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vi.advanceTimersByTime(1);
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expect(seen).toEqual([1]);
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vi.advanceTimersByTime(2800 * 2);
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expect(seen).toEqual([1, 2, 0]);
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expect(ctl.index).toBe(0);
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ctl.stop();
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});
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it("does not advance while paused and resumes after", () => {
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const onChange = vi.fn();
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const ctl = startFeaturedAutoplay({ count: 5, onChange });
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ctl.pause();
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expect(ctl.paused).toBe(true);
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vi.advanceTimersByTime(4000 * 3);
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expect(onChange).not.toHaveBeenCalled();
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expect(ctl.index).toBe(0);
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ctl.resume();
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vi.advanceTimersByTime(2800);
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expect(onChange).toHaveBeenCalledWith(1);
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ctl.stop();
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});
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it("never rotates a single expert and stops cleanly", () => {
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const one = vi.fn();
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startFeaturedAutoplay({ count: 1, onChange: one });
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vi.advanceTimersByTime(10_000);
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expect(one).not.toHaveBeenCalled();
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const many = vi.fn();
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const ctl = startFeaturedAutoplay({ count: 4, onChange: many });
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ctl.stop();
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vi.advanceTimersByTime(10_000);
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expect(many).not.toHaveBeenCalled();
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});
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});
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describe("FeaturedCarousel markup", () => {
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it("has a polite live region, hides non-center items and shows the counter and dots", () => {
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const out = renderToStaticMarkup(createElement(FeaturedCarousel, { experts: experts(8) }));
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expect(out).toContain('aria-live="polite"');
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expect(out.match(/data-testid="featured-item"/g)).toHaveLength(8);
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expect(out.match(/aria-hidden="true" data-testid="featured-item"/g)).toHaveLength(7);
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expect(out).toContain("featured-c0");
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expect(out).toContain(">1 / 8<");
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expect(out.match(/class="featured-dot( featured-dot-on)?"/g)).toHaveLength(8);
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expect(out.match(/featured-dot-on/g)).toHaveLength(1);
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expect(out).toContain("--cfw:96px");
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});
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it("takes a size prop for mobile", () => {
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const out = renderToStaticMarkup(createElement(FeaturedCarousel, { experts: experts(3), size: 156 }));
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expect(out).toContain("--cfw:156px");
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});
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it("shows no dots for a single expert", () => {
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const out = renderToStaticMarkup(createElement(FeaturedCarousel, { experts: experts(1) }));
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expect(out).not.toContain("featured-dot ");
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expect(out).toContain(">1 / 1<");
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});
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});
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