import { assertRejects } from "https://deno.land/x/cliffy@v0.23.0/dev_deps.ts";
Executes a function which returns a promise, expecting it to throw or 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. Or you can pass a callback which will be passed the error, usually to apply some custom assertions on it.
Parameters
optional
ErrorClass: new (...args: any[]) => E