Node.js assert.throws with async functions (Promises)

Question

I want to check if an async function throws using assert.throws from the native assert module. I tried with

const test = async () => await aPromi         


        

Answer 1

Based on Bergi answer I've suggest more universal solution that utilizes original assert.throws for error messages:

import assert from 'assert';

async function assertThrowsAsync(fn, regExp) {
  let f = () => {};
  try {
    await fn();
  } catch(e) {
    f = () => {throw e};
  } finally {
    assert.throws(f, regExp);
  }
}

Usage:

it('should throw', async function () {
    await assertThrowsAsync(async () => await asyncTask(), /Error/);
});