From 3a31128827806a27df368fbc5fe8cccae4bb507f Mon Sep 17 00:00:00 2001
From: Adam Gastineau <adam@agg.im>
Date: Tue, 18 Feb 2025 11:27:23 -0800
Subject: [PATCH] Add Promise prototype test

---
 tests/playwright-test/warnings.spec.ts | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tests/playwright-test/warnings.spec.ts b/tests/playwright-test/warnings.spec.ts
index db1152ee91..ce4796cfd6 100644
--- a/tests/playwright-test/warnings.spec.ts
+++ b/tests/playwright-test/warnings.spec.ts
@@ -158,4 +158,18 @@ test.describe('await', () => {
     expect(exitCode).toBe(0);
     expect(stdout).toContain(warningSnippet);
   });
+
+  test('traced promise should be instanceof Promise', async ({ runInlineTest }) => {
+    const { exitCode } = await runInlineTest({
+      'a.test.ts': `
+        import { test, expect } from '@playwright/test';
+        test('test', async ({ page }) => {
+          await page.setContent('data:text/html,<div>A</div>');
+          const expectPromise = expect(page.locator('div')).toHaveText('A');
+          expect(expectPromise instanceof Promise).toBeTruthy();
+        });
+      `
+    });
+    expect(exitCode).toBe(0);
+  });
 });