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doc: update assert.rejects docs with a validation function example #31271

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doc: update assert.rejects docs with a validation function example #31271

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15 changes: 15 additions & 0 deletions doc/api/assert.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1133,6 +1133,21 @@ if the `asyncFn` fails to reject.
})();
```

```js
(async () => {
await assert.rejects(
async () => {
throw new TypeError('Wrong value');
},
(err) => {
assert.strictEqual(err.name, 'TypeError');
assert.strictEqual(err.message, 'Wrong value');
return true;
}
);
})();
```

```js
assert.rejects(
Promise.reject(new Error('Wrong value')),
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