Function assertThrows

assertThrows<E>(fn, errorClassOrMsg?, msgIncludesOrMsg?, msg?): E | Error | unknown
Executes a function, expecting it to throw. If it does not, then it throws. An error class and a string that should be included in the error message can also be asserted.

To assert that an asynchronous function rejects, use assertRejects.
Type Parameters
- E extends Error = Error
Parameters
- fn: (() => unknown)
  - - (): unknown
    - Returns unknown
- Optional errorClassOrMsg: string | (new (...args) => E)
- Optional msgIncludesOrMsg: string
- Optional msg: string
Returns E | Error | unknown
Since
24.7.0

Example
```
import { assertThrows } from "assert";

assertThrows(() => { throw new TypeError("hello world!"); }, TypeError); // Doesn't throw
assertThrows(() => { throw new TypeError("hello world!"); }, RangeError); // Throws
```