✅(e2e) test the pdf export of the impress app

Add a test to check the pdf export of the
impress app.
It intercept the download of the PDF and
read its content.
We can assert that the template is correctly
rendered, and that the pad text is present as
well.

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

@@ -1,4 +1,6 @@
 import { expect, test } from '@playwright/test';
+import cs from 'convert-stream';
+import pdf from 'pdf-parse';
 
 import { keyCloakSignIn } from './common';
 
@@ -42,4 +44,30 @@ test.describe('Pad Editor', () => {
     const typeCases = ['publish', 'subscribe', 'unsubscribe', 'ping'];
     expect(typeCases.includes(payload.type)).toBeTruthy();
   });
+
+  test('it converts the pad to pdf with a template integrated', async ({
+    page,
+  }) => {
+    const downloadPromise = page.waitForEvent('download', (download) => {
+      return download.suggestedFilename().includes('impress-document.pdf');
+    });
+
+    await page.getByText('My mocked pad').first().click();
+    await expect(page.locator('h2').getByText('My mocked pad')).toBeVisible();
+
+    await page.locator('.ProseMirror.bn-editor').click();
+    await page.locator('.ProseMirror.bn-editor').fill('Hello World');
+
+    await page.getByText('Print the pad').first().click();
+
+    const download = await downloadPromise;
+    expect(download.suggestedFilename()).toBe('impress-document.pdf');
+
+    const pdfBuffer = await cs.toBuffer(await download.createReadStream());
+    const pdfText = (await pdf(pdfBuffer)).text;
+
+    expect(pdfText).toContain('Monsieur le Premier Ministre'); // This is the template text
+    expect(pdfText).toContain('La directrice'); // This is the template text
+    expect(pdfText).toContain('Hello World'); // This is the pad text
+  });
 });

src/frontend/apps/e2e/package.json

@@ -11,7 +11,12 @@
   "devDependencies": {
     "@playwright/test": "1.42.1",
     "@types/node": "*",
+    "@types/pdf-parse": "1.1.4",
     "eslint-config-impress": "*",
     "typescript": "*"
+  },
+  "dependencies": {
+    "convert-stream": "1.0.2",
+    "pdf-parse": "^1.1.1"
   }
 }

src/frontend/apps/e2e/tsconfig.json

@@ -14,6 +14,6 @@
     "jsx": "preserve",
     "incremental": true,
   },
-  "include": ["**/*.ts"],
+  "include": ["**/*.ts", "**/*.d.ts"],
   "exclude": ["node_modules"]
 }

src/frontend/apps/e2e/type/convert-stream.d.ts

@@ -0,0 +1,5 @@
+declare module 'convert-stream' {
+  export function toBuffer(
+    readableStream: NodeJS.ReadableStream,
+  ): Promise<Buffer>;
+}