testing.assertThrows | /deps.ts | denoexec@v1.1.5

function testing.assertThrows

import { testing } from "https://deno.land/x/denoexec@v1.1.5/deps.ts";
const { assertThrows } = testing;

assertThrows<E extends Error = Error>(

fn: () => unknown,

ErrorClass?: new (...args: any[]) => E,

msgIncludes?: string,

msg?: string,

): void

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. Or you can pass a callback which will be passed the error, usually to apply some custom assertions on it.

assertThrows(

fn: () => unknown,

errorCallback: (e: Error) => unknown,

msg?: string,

): void