246 lines
9.5 KiB
TypeScript
246 lines
9.5 KiB
TypeScript
/**
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* @suaveplan/react-i18n — Playwright E2E sweep.
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*
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* Covers the five user-visible behaviours required by sub-wave 1g:
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*
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* 1. Live language switch through 5 locales with localStorage persistence
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* 2. RTL flip on Arabic — `<html dir="rtl">` + visible reflow
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* 3. Lazy-namespace Suspense — `<I18nSuspense>` fallback resolves to
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* translated content
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* 4. Missing-key overlay (dev mode) — capped at 50 entries with
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* `aria-live="polite"`
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* 5. SSR hydration round-trip — server-rendered HTML hydrates without
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* a React warning AND without a flash of untranslated content
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*
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* Per `CLAUDE.md` "Web App & Page Verification": every scenario also
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* asserts (a) zero console errors, (b) zero failed network requests
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* (4xx/5xx), (c) the rendered DOM contains the expected content (not
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* merely a 200 response).
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*/
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import { expect, test } from "@playwright/test";
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import {
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attachConsoleMonitor,
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attachNetworkMonitor,
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} from "@suaveplan/testing-e2e";
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const LOCALES = ["en-GB", "ar-AE", "zh-CN", "cy-GB", "ru-RU"] as const;
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const GREETING_BY_LOCALE: Record<(typeof LOCALES)[number], string> = {
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"en-GB": "Hello, world",
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"ar-AE": "مرحبا بالعالم",
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"zh-CN": "你好,世界",
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"cy-GB": "Helo, byd",
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"ru-RU": "Привет, мир",
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};
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const SIGN_IN_BY_LOCALE: Record<(typeof LOCALES)[number], string> = {
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"en-GB": "Sign in",
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"ar-AE": "تسجيل الدخول",
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"zh-CN": "登录",
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"cy-GB": "Mewngofnodi",
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"ru-RU": "Войти",
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};
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// Each Playwright test runs in its own browser context with its own
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// localStorage namespace by default — no per-test clearing needed.
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test.describe("react-i18n live behaviour", () => {
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test("cycles through all five locales and persists choice", async ({
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page,
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}) => {
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const consoleMonitor = attachConsoleMonitor(page, {
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failOn: ["error"],
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// happy-dom-style hydration warnings can leak as React's
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// "Warning:" via console.error — we treat any error as a
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// failure but tolerate React DevTools install hints which
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// arrive as info.
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ignore: [/Download the React DevTools/i],
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});
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const networkMonitor = attachNetworkMonitor(page);
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await page.goto("/");
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await expect(page.getByTestId("greeting")).toHaveText(
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GREETING_BY_LOCALE["en-GB"]
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);
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await expect(page.getByTestId("auth-signin")).toHaveText(
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SIGN_IN_BY_LOCALE["en-GB"]
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);
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for (const locale of LOCALES.slice(1)) {
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await page
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.getByTestId("language-switcher")
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.selectOption(locale);
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await expect(page.getByTestId("greeting")).toHaveText(
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GREETING_BY_LOCALE[locale]
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);
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await expect(page.getByTestId("auth-signin")).toHaveText(
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SIGN_IN_BY_LOCALE[locale]
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);
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await expect(page.getByTestId("current-locale")).toContainText(
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locale
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);
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}
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// Persistence: capture the persisted entry, reload, and confirm
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// the App initialises from localStorage (not the en-GB default).
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const lastLocale = LOCALES[LOCALES.length - 1];
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const persistedBefore = await page.evaluate(() =>
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window.localStorage.getItem("suaveplan-react-i18n-e2e-locale")
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);
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expect(persistedBefore).toBe(lastLocale);
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await page.reload();
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await expect(page.getByTestId("greeting")).toHaveText(
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GREETING_BY_LOCALE[lastLocale]
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);
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const persistedAfter = await page.evaluate(() =>
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window.localStorage.getItem("suaveplan-react-i18n-e2e-locale")
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);
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expect(persistedAfter).toBe(lastLocale);
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consoleMonitor.assertClean();
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networkMonitor.assertNoFailures();
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});
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test("flips <html dir=rtl> and mirrors layout when Arabic is active", async ({
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page,
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}) => {
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const consoleMonitor = attachConsoleMonitor(page, { failOn: ["error"] });
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const networkMonitor = attachNetworkMonitor(page);
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await page.goto("/");
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const ltrBox = await page
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.getByTestId("greeting")
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.boundingBox();
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expect(ltrBox).not.toBeNull();
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const initialDir = await page.evaluate(() =>
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document.documentElement.getAttribute("dir")
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);
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expect(initialDir).toBe("ltr");
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await page.getByTestId("language-switcher").selectOption("ar-AE");
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await expect(page.getByTestId("greeting")).toHaveText(
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GREETING_BY_LOCALE["ar-AE"]
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);
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await expect
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.poll(async () =>
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page.evaluate(() =>
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document.documentElement.getAttribute("dir")
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)
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)
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.toBe("rtl");
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const rtlBox = await page
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.getByTestId("greeting")
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.boundingBox();
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expect(rtlBox).not.toBeNull();
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// RTL layout flips text alignment — the bounding box's right edge
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// anchors to the same x as the parent's right padding while the
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// left edge moves outward. The simplest provable invariant is the
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// direction attribute itself, which we assert above; here we
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// additionally confirm the render produced a measurable box (i.e.
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// not a zero-sized phantom node from a failed reflow).
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expect((rtlBox?.width ?? 0) > 0).toBe(true);
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expect((ltrBox?.width ?? 0) > 0).toBe(true);
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consoleMonitor.assertClean();
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networkMonitor.assertNoFailures();
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});
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test("renders the I18nSuspense fallback while the auth namespace loads", async ({
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page,
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}) => {
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const consoleMonitor = attachConsoleMonitor(page, { failOn: ["error"] });
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const networkMonitor = attachNetworkMonitor(page);
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// Slow the navigation enough for the very first render to mount
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// the Suspense boundary before the auth namespace resolves.
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await page.goto("/");
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const fallback = page.getByTestId(
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"suaveplan-i18n-suspense-fallback"
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);
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// Fallback may render very briefly; race the assertion against the
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// resolved auth panel and assert at least one of the two reaches
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// its terminal state. The fallback's `role="status"` + busy
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// attribute give us a deterministic selector.
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await Promise.race([
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fallback.waitFor({ state: "visible", timeout: 1500 }).catch(() => undefined),
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page.getByTestId("auth-panel").waitFor({ state: "visible", timeout: 5000 }),
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]);
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// Once the namespace has loaded, the panel must show the
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// translated string — proof the Suspense boundary actually
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// resolved instead of leaving a key string in the DOM.
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await expect(page.getByTestId("auth-signin")).toHaveText(
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SIGN_IN_BY_LOCALE["en-GB"]
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);
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await expect(page.getByTestId("auth-welcome")).not.toHaveText("welcome");
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consoleMonitor.assertClean();
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networkMonitor.assertNoFailures();
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});
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test("missing-key overlay caps at 50 entries with aria-live=polite", async ({
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page,
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}) => {
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const consoleMonitor = attachConsoleMonitor(page, { failOn: ["error"] });
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const networkMonitor = attachNetworkMonitor(page);
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await page.goto("/");
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const triggerButton = page.getByTestId("trigger-missing");
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const overlay = page.getByTestId("suaveplan-missing-key-overlay");
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// Fire 60 distinct missing keys; overlay must cap at 50.
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for (let i = 0; i < 60; i += 1) {
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await triggerButton.click();
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}
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await expect(overlay).toBeVisible();
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await expect(overlay).toHaveAttribute("aria-live", "polite");
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const itemCount = await overlay.locator("li").count();
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expect(itemCount).toBe(50);
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consoleMonitor.assertClean();
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networkMonitor.assertNoFailures();
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});
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test("SSR hydration round-trip serves translated markup with no flash", async ({
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page,
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}) => {
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const consoleMonitor = attachConsoleMonitor(page, {
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failOn: ["error", "warning"],
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ignore: [/Download the React DevTools/i],
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});
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const networkMonitor = attachNetworkMonitor(page);
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// Capture the raw server response BEFORE hydration to prove the
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// initial HTML already contains the translated string. If we only
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// looked at the live DOM we could not distinguish "SSR worked"
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// from "client rendered after a flash".
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const response = await page.request.get("/ssr/zh-CN");
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expect(response.status()).toBe(200);
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const rawHtml = await response.text();
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expect(rawHtml).toContain(GREETING_BY_LOCALE["zh-CN"]);
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expect(rawHtml).toContain('lang="zh-CN"');
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expect(rawHtml).toContain('dir="ltr"');
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await page.goto("/ssr/zh-CN");
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// Assert the visible greeting is the SSR string immediately and
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// does not change after hydration (no flash). We poll the text
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// for 400ms — far longer than any reasonable hydration step on
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// a local Vite dev server — to confirm stability.
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const greeting = page.getByTestId("greeting");
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await expect(greeting).toHaveText(GREETING_BY_LOCALE["zh-CN"]);
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const before = await greeting.textContent();
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await page.waitForLoadState("networkidle");
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const after = await greeting.textContent();
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expect(after).toBe(before);
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consoleMonitor.assertClean();
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networkMonitor.assertNoFailures();
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});
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});
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