Describe the bug
When using vi.useFakeTimers(), expect.poll does not work. I believe it should handle this by internally calling vi.advanceTimersByTime(interval), as vi.waitFor does.
Reproduction
// example.spec.ts
import { expect, test, vi } from "vitest";
test("expect.poll with fake timers", async () => {
vi.useFakeTimers();
let count = 0;
setTimeout(() => {
count = 1;
}, 1000);
await expect.poll(() => count, { timeout: 2000 }).toBe(1);
vi.useRealTimers();
});
test("vi.waitFor with fake timers", async () => {
vi.useFakeTimers();
let count = 0;
setTimeout(() => {
count = 1;
}, 1000);
await vi.waitFor(() => expect(count).toBe(1), { timeout: 2000 });
vi.useRealTimers();
});❯ unit src/example.spec.ts (2 tests | 1 failed) 3232ms
× expect.poll with fake timers 2052ms
✓ vi.waitFor with fake timers 1178ms
⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ Failed Tests 1 ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯
FAIL unit src/example.spec.ts > expect.poll with fake timers
AssertionError: expected +0 to be 1 // Object.is equality
- Expected
+ Received
- 1
+ 0
❯ src/example.spec.ts:12:53
10| }, 1000);
11|
12| await expect.poll(() => count, { timeout: 2000 }).toBe(1);
| ^
13|
14| vi.useRealTimers();
Caused by: Error: Matcher did not succeed in time.
❯ src/example.spec.ts:12:3
System Info
System:
OS: Windows 11 10.0.26200
CPU: (8) x64 Intel(R) Core(TM) i3-10100F CPU @ 3.60GHz
Memory: 15.31 GB / 31.93 GB
Binaries:
Node: 22.21.1 - C:\Users\Micha\AppData\Local\mise\installs\node\22.21.1\node.EXE
Yarn: 1.22.22 - C:\Users\Micha\AppData\Local\mise\installs\node\22.21.1\yarn.CMD
npm: 11.12.0 - C:\Users\Micha\AppData\Local\mise\installs\node\22.21.1\npm.CMD
pnpm: 10.33.0 - C:\Users\Micha\AppData\Local\mise\installs\node\22.21.1\pnpm.CMD
Browsers:
Chrome: 146.0.7680.165
Edge: Chromium (142.0.3595.69)
npmPackages:
@vitejs/plugin-react: ^6.0.1 => 6.0.1
@vitest/browser-playwright: ^4.1.2 => 4.1.2
playwright: ^1.58.2 => 1.58.2
vite: ^8.0.1 => 8.0.3
vitest: ^4.1.2 => 4.1.2
vitest-browser-react: ^2.1.0 => 2.1.0Used Package Manager
pnpm
Validations
Describe the bug
When using
vi.useFakeTimers(),expect.polldoes not work. I believe it should handle this by internally callingvi.advanceTimersByTime(interval), asvi.waitFordoes.Reproduction
System Info
System: OS: Windows 11 10.0.26200 CPU: (8) x64 Intel(R) Core(TM) i3-10100F CPU @ 3.60GHz Memory: 15.31 GB / 31.93 GB Binaries: Node: 22.21.1 - C:\Users\Micha\AppData\Local\mise\installs\node\22.21.1\node.EXE Yarn: 1.22.22 - C:\Users\Micha\AppData\Local\mise\installs\node\22.21.1\yarn.CMD npm: 11.12.0 - C:\Users\Micha\AppData\Local\mise\installs\node\22.21.1\npm.CMD pnpm: 10.33.0 - C:\Users\Micha\AppData\Local\mise\installs\node\22.21.1\pnpm.CMD Browsers: Chrome: 146.0.7680.165 Edge: Chromium (142.0.3595.69) npmPackages: @vitejs/plugin-react: ^6.0.1 => 6.0.1 @vitest/browser-playwright: ^4.1.2 => 4.1.2 playwright: ^1.58.2 => 1.58.2 vite: ^8.0.1 => 8.0.3 vitest: ^4.1.2 => 4.1.2 vitest-browser-react: ^2.1.0 => 2.1.0Used Package Manager
pnpm
Validations