node/test/parallel/test-assert-if-error.js at main · nodejs/node · GitHub

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'use strict';

require('../common');
const assert = require('assert');
const { test } = require('node:test');

test('Test that assert.ifError has the correct stack trace of both stacks', () => {
  let err;
  // Create some random error frames.
  (function a() {
    (function b() {
      (function c() {
        err = new Error('test error');
      })();
    })();
  })();

  const msg = err.message;
  const stack = err.stack;

  (function x() {
    (function y() {
      (function z() {
        let threw = false;
        try {
          assert.ifError(err);
        } catch (e) {
          assert.strictEqual(e.message,
                             'ifError got unwanted exception: test error');
          assert.strictEqual(err.message, msg);
          assert.strictEqual(e.actual, err);
          assert.strictEqual(e.actual.stack, stack);
          assert.strictEqual(e.expected, null);
          assert.strictEqual(e.operator, 'ifError');
          threw = true;
        }
        assert(threw);
      })();
    })();
  })();
});

test('General ifError tests', () => {
  assert.throws(
    () => {
      const error = new Error();
      error.stack = 'Error: containing weird stack\nYes!\nI am part of a stack.';
      assert.ifError(error);
    },
    (error) => {
      assert(!error.stack.includes('Yes!'));
      return true;
    }
  );

  assert.throws(
    () => assert.ifError(new TypeError()),
    {
      message: 'ifError got unwanted exception: TypeError'
    }
  );

  assert.throws(
    () => assert.ifError({ stack: false }),
    {
      message: 'ifError got unwanted exception: { stack: false }'
    }
  );

  assert.throws(
    () => assert.ifError({ constructor: null, message: '' }),
    {
      message: 'ifError got unwanted exception: '
    }
  );

  assert.throws(
    () => { assert.ifError(false); },
    {
      message: 'ifError got unwanted exception: false'
    }
  );
});

test('Should not throw', () => {
  assert.ifError(null);
  assert.ifError();
  assert.ifError(undefined);
});

test('https://github.com/nodejs/node-v0.x-archive/issues/2893', () => {
  let threw = false;
  try {
    // eslint-disable-next-line no-restricted-syntax
    assert.throws(() => {
      assert.ifError(null);
    });
  } catch (e) {
    threw = true;
    assert.strictEqual(e.message, 'Missing expected exception.');
    assert(!e.stack.includes('throws'), e);
  }
  assert(threw);
});