> For AI agents: the complete documentation index is available at https://rslint.rs/llms.txt, the full documentation bundle is available at https://rslint.rs/llms-full.txt.

# expect-expect

[Added in v0.8.1](https://github.com/web-infra-dev/rslint/releases/tag/v0.8.1)
## Configuration

| Preset                             | Configured Value |
| ---------------------------------- | ---------------- |
| ✅ rstestPlugin.configs.all         | `"warn"`         |
| ✅ rstestPlugin.configs.recommended | `"warn"`         |


```ts title=rslint.config.ts
import { defineConfig, rstestPlugin } from '@rslint/core';

export default defineConfig([
  rstestPlugin.configs.recommended,
  {
    rules: {
      'rstest/expect-expect': 'error',
    },
  },
]);
```

## Rule Details

Requires every Rstest `test` or `it` callback to contain an assertion. This prevents tests from passing after exercising code without verifying its result.

By default, both `expect` and Chai's `assert` count as assertions. `test.todo` and `it.todo` are exempt because they intentionally have no callback; globals, imports, aliases, parameterized tests, fixtures, and Playwright integrations are recognized.

## Incorrect

```ts
test('creates a user', async () => {
  await createUser({ name: 'Ada' });
});
```

## Correct

```ts
test('creates a user', async () => {
  const user = await createUser({ name: 'Ada' });

  expect(user.name).toBe('Ada');
});
```

## Options

```json
{
  "rstest/expect-expect": [
    "error",
    {
      "assertFunctionNames": ["expect", "assert", "assertUser"],
      "additionalTestBlockFunctions": ["scenario"]
    }
  ]
}
```

| Option                         | Type       | Default                | Description                                                                             |
| ------------------------------ | ---------- | ---------------------- | --------------------------------------------------------------------------------------- |
| `assertFunctionNames`          | `string[]` | `["expect", "assert"]` | Function names or patterns treated as assertions. Setting it replaces the default list. |
| `additionalTestBlockFunctions` | `string[]` | `[]`                   | Additional functions whose callbacks are treated as test blocks.                        |