---
title: expect | Config
outline: deep
---

# expect

- **Type:** `ExpectOptions`

## expect.requireAssertions

- **Type:** `boolean`
- **Default:** `false`

The same as calling [`expect.hasAssertions()`](/api/expect#expect-hasassertions) at the start of every test. This makes sure that no test will pass accidentally.

::: tip
This only works with Vitest's `expect`. If you use `assert` or `.should` assertions, they will not count, and your test will fail due to the lack of expect assertions.

You can change the value of this by calling `vi.setConfig({ expect: { requireAssertions: false } })`. The config will be applied to every subsequent `expect` call until the `vi.resetConfig` is called manually.
:::

::: warning
When you run tests with `sequence.concurrent` and `expect.requireAssertions` set to `true`, you should use [local expect](/guide/test-context.html#expect) instead of the global one. Otherwise, this may cause false negatives in [some situations (#8469)](https://github.com/vitest-dev/vitest/issues/8469).
:::

## expect.poll

Global configuration options for [`expect.poll`](/api/expect#poll). These are the same options you can pass down to `expect.poll(condition, options)`.

### expect.poll.interval

- **Type:** `number`
- **Default:** `50`

Polling interval in milliseconds

### expect.poll.timeout

- **Type:** `number`
- **Default:** `1000`

Polling timeout in milliseconds