Add backend unit/integration tests, Playwright e2e tests, README, cookie Secure fix

backend/tests/integration/setup/globalSetup.ts

@@ -0,0 +1,31 @@
+import { Client } from 'pg';
+
+async function waitForDb(retries = 20): Promise<void> {
+  const config = {
+    host: process.env.TEST_PGHOST || 'localhost',
+    port: parseInt(process.env.TEST_PGPORT || '55432', 10),
+    user: process.env.TEST_PGUSER || 'redefined_test',
+    password: process.env.TEST_PGPASSWORD || 'redefined_test',
+    database: process.env.TEST_PGDATABASE || 'redefined_test'
+  };
+  for (let i = 0; i < retries; i++) {
+    const client = new Client(config);
+    try {
+      await client.connect();
+      await client.end();
+      return;
+    } catch {
+      await new Promise(r => setTimeout(r, 1000));
+    }
+  }
+  throw new Error(
+    'Could not reach the test database on port 55432. Run `npm run db:test:up` before `npm run test:integration`.'
+  );
+}
+
+export default async function globalSetup(): Promise<void> {
+  await waitForDb();
+  const { migrate, closeDb } = await import('./testDb');
+  await migrate();
+  await closeDb();
+}