test-assert-async.js

'use strict';
const common = require('../common');
const assert = require('assert');
const { promisify } = require('util');
const wait = promisify(setTimeout);

/* eslint-disable prefer-common-expectserror, no-restricted-properties */

// Test assert.rejects() and assert.doesNotReject() by checking their
// expected output and by verifying that they do not work sync

assert.rejects(
  () => assert.fail(),
  common.expectsError({
    code: 'ERR_ASSERTION',
    type: assert.AssertionError,
    message: 'Failed'
  })
);

assert.doesNotReject(() => {});

{
  const promise = assert.rejects(async () => {
    await wait(1);
    assert.fail();
  }, common.expectsError({
    code: 'ERR_ASSERTION',
    type: assert.AssertionError,
    message: 'Failed'
  }));
  assert.doesNotReject(() => promise);
}

{
  const promise = assert.doesNotReject(async () => {
    await wait(1);
    throw new Error();
  });
  assert.rejects(() => promise,
                 (err) => {
                   assert(err instanceof assert.AssertionError,
                          `${err.name} is not instance of AssertionError`);
                   assert.strictEqual(err.code, 'ERR_ASSERTION');
                   assert(/^Got unwanted rejection\.\n$/.test(err.message));
                   assert.strictEqual(err.operator, 'doesNotReject');
                   assert.ok(!err.stack.includes('at Function.doesNotReject'));
                   return true;
                 }
  );
}

{
  const promise = assert.rejects(() => {});
  assert.rejects(() => promise,
                 (err) => {
                   assert(err instanceof assert.AssertionError,
                          `${err.name} is not instance of AssertionError`);
                   assert.strictEqual(err.code, 'ERR_ASSERTION');
                   assert(/^Missing expected rejection\.$/.test(err.message));
                   assert.strictEqual(err.operator, 'rejects');
                   assert.ok(!err.stack.includes('at Function.rejects'));
                   return true;
                 }
  );
}