✅(e2e) ensure i18n.language is injected into generated PDF

Adds an end-to-end test to verify language injection in the generated PDF.

Signed-off-by: Cyril <c.gromoff@gmail.com>

src/frontend/apps/e2e/__tests__/app-impress/doc-export.spec.ts

@@ -4,7 +4,13 @@ import { expect, test } from '@playwright/test';
 import cs from 'convert-stream';
 import pdf from 'pdf-parse';
 
-import { createDoc, verifyDocName } from './utils-common';
+import {
+  TestLanguage,
+  createDoc,
+  randomName,
+  verifyDocName,
+  waitForLanguageSwitch,
+} from './utils-common';
 import { createRootSubPage } from './utils-sub-pages';
 
 test.beforeEach(async ({ page }) => {
@@ -413,6 +419,75 @@ test.describe('Doc Export', () => {
     expect(pdfData.text).toContain('Column 3');
   });
 
+  test('it injects the correct language attribute into PDF export', async ({
+    page,
+    browserName,
+  }) => {
+    await waitForLanguageSwitch(page, TestLanguage.French);
+
+    // Wait for the page to be ready after language switch
+    await page.waitForLoadState('domcontentloaded');
+
+    const header = page.locator('header').first();
+    await header.locator('h2').getByText('Docs').click();
+
+    const randomDocFrench = randomName(
+      'doc-language-export-french',
+      browserName,
+      1,
+    )[0];
+
+    await page
+      .getByRole('button', {
+        name: 'Nouveau doc',
+      })
+      .click();
+
+    await page.waitForURL('**/docs/**', {
+      timeout: 10000,
+      waitUntil: 'domcontentloaded',
+    });
+
+    const input = page.getByLabel('doc title input');
+    await expect(input).toBeVisible();
+    await expect(input).toHaveText('');
+    await input.click();
+    await input.fill(randomDocFrench);
+    await input.blur();
+
+    const editor = page.locator('.ProseMirror.bn-editor');
+    await editor.click();
+    await editor.fill('Contenu de test pour export en français');
+
+    await page
+      .getByRole('button', {
+        name: 'download',
+        exact: true,
+      })
+      .click();
+
+    const downloadPromise = page.waitForEvent('download', (download) => {
+      return download.suggestedFilename().includes(`${randomDocFrench}.pdf`);
+    });
+
+    void page
+      .getByRole('button', {
+        name: 'Télécharger',
+        exact: true,
+      })
+      .click();
+
+    const download = await downloadPromise;
+    expect(download.suggestedFilename()).toBe(`${randomDocFrench}.pdf`);
+
+    const pdfBuffer = await cs.toBuffer(await download.createReadStream());
+    const pdfString = pdfBuffer.toString('latin1');
+
+    expect(pdfString).toContain('/Lang (fr)');
+
+    await waitForLanguageSwitch(page, TestLanguage.English);
+  });
+
   test('it exports the doc with interlinking', async ({
     page,
     browserName,

src/frontend/apps/e2e/__tests__/app-impress/language.spec.ts

@@ -1,6 +1,6 @@
 import { Page, expect, test } from '@playwright/test';
 
-import { createDoc } from './utils-common';
+import { TestLanguage, createDoc, waitForLanguageSwitch } from './utils-common';
 
 test.describe.serial('Language', () => {
   let page: Page;
@@ -100,48 +100,3 @@ test.describe.serial('Language', () => {
     await expect(page.getByText('Titres', { exact: true })).toBeVisible();
   });
 });
-
-// language helper
-export const TestLanguage = {
-  English: {
-    label: 'English',
-    expectedLocale: ['en-us'],
-  },
-  French: {
-    label: 'Français',
-    expectedLocale: ['fr-fr'],
-  },
-  German: {
-    label: 'Deutsch',
-    expectedLocale: ['de-de'],
-  },
-} as const;
-
-type TestLanguageKey = keyof typeof TestLanguage;
-type TestLanguageValue = (typeof TestLanguage)[TestLanguageKey];
-
-export async function waitForLanguageSwitch(
-  page: Page,
-  lang: TestLanguageValue,
-) {
-  const header = page.locator('header').first();
-  const languagePicker = header.locator('.--docs--language-picker-text');
-  const isAlreadyTargetLanguage = await languagePicker
-    .innerText()
-    .then((text) => text.toLowerCase().includes(lang.label.toLowerCase()));
-
-  if (isAlreadyTargetLanguage) {
-    return;
-  }
-
-  await languagePicker.click();
-  const responsePromise = page.waitForResponse(
-    (resp) =>
-      resp.url().includes('/user') && resp.request().method() === 'PATCH',
-  );
-  await page.getByLabel(lang.label).click();
-  const resolvedResponsePromise = await responsePromise;
-  const responseData = await resolvedResponsePromise.json();
-
-  expect(lang.expectedLocale).toContain(responseData.language);
-}

src/frontend/apps/e2e/__tests__/app-impress/utils-common.ts

@@ -273,3 +273,49 @@ export const expectLoginPage = async (page: Page) =>
   ).toBeVisible({
     timeout: 10000,
   });
+// language helper
+export const TestLanguage = {
+  English: {
+    label: 'English',
+    expectedLocale: ['en-us'],
+  },
+  French: {
+    label: 'Français',
+    expectedLocale: ['fr-fr'],
+  },
+  German: {
+    label: 'Deutsch',
+    expectedLocale: ['de-de'],
+  },
+} as const;
+
+type TestLanguageKey = keyof typeof TestLanguage;
+type TestLanguageValue = (typeof TestLanguage)[TestLanguageKey];
+
+export async function waitForLanguageSwitch(
+  page: Page,
+  lang: TestLanguageValue,
+) {
+  const header = page.locator('header').first();
+  const languagePicker = header.locator('.--docs--language-picker-text');
+  const isAlreadyTargetLanguage = await languagePicker
+    .innerText()
+    .then((text) => text.toLowerCase().includes(lang.label.toLowerCase()));
+
+  if (isAlreadyTargetLanguage) {
+    return;
+  }
+
+  await languagePicker.click();
+  const responsePromise = page.waitForResponse(
+    (resp) =>
+      resp.url().includes('/user') && resp.request().method() === 'PATCH',
+  );
+  await page.getByLabel(lang.label).click();
+  const resolvedResponsePromise = await responsePromise;
+  const responseData = (await resolvedResponsePromise.json()) as {
+    language: string;
+  };
+
+  expect(lang.expectedLocale).toContain(responseData.language);
+}