Module

std/testing/asserts.ts

Deno standard library
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function assertRejects
import { assertRejects } from "https://deno.land/std@0.146.0/testing/asserts.ts";

Executes a function which returns a promise, expecting it to reject.

Parameters

fn: () => Promise<unknown>
optional
msg: string

Returns

Promise<unknown>

Executes a function which returns a promise, expecting it to reject. 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.

Type Parameters

optional
E extends Error = Error

Parameters

fn: () => Promise<unknown>
ErrorClass: new (...args: any[]) => E
optional
msgIncludes: string
optional
msg: string

Returns

Promise<E>

Parameters

fn: () => Promise<unknown>
errorCallback: (e: Error) => unknown
optional
msg: string

Returns

Promise<Error>

Type Parameters

optional
E extends Error = Error

Parameters

fn: () => Promise<unknown>
optional
errorClassOrCallbackOrMsg: (new (...args: any[]) => E) | ((e: Error) => unknown) | string
optional
msgIncludesOrMsg: string
optional
msg: string

Returns

Promise<E | Error | unknown>