feat: add tests for /api/chat (#950)

tests/fixtures.ts

@@ -0,0 +1,34 @@
+import { expect as baseExpect, test as baseTest } from '@playwright/test';
+import { createAuthenticatedContext, type UserContext } from './auth-helper';
+
+interface Fixtures {
+  adaContext: UserContext;
+  babbageContext: UserContext;
+}
+
+export const test = baseTest.extend<any, Fixtures>({
+  adaContext: [
+    async ({ browser }, use) => {
+      const ada = await createAuthenticatedContext({
+        browser,
+        name: 'ada',
+      });
+      await use(ada);
+      await ada.context.close();
+    },
+    { scope: 'worker' },
+  ],
+  babbageContext: [
+    async ({ browser }, use) => {
+      const babbage = await createAuthenticatedContext({
+        browser,
+        name: 'babbage',
+      });
+      await use(babbage);
+      await babbage.context.close();
+    },
+    { scope: 'worker' },
+  ],
+});
+
+export const expect = baseExpect;