'assert' does not have error until next tick

[mattdesl]

I've noticed the callback to assert is triggered too early. It has an error object, but the properties are all undefined until the next tick. Have you run into this before?

[scottcorgan]

Can you show me some code and maybe a screenshot?

[mattdesl]

here's a test:

test('handles error immediately', function (t) {

  t.plan(2);

  var mockTap = [
    "TAP version 13",
    "# is true",
    "ok 1 true value",
    "ok 2 true value",
    "not ok 3 strings match",
    "  ---",
    "    operator: equal",
    "    expected: 'you'",
    "    actual:   'me'",
    "    at: Test.<anonymous> (http://localhost:9966/index.js:8:5)",
    "  ...",
    "not ok 15 plan != count",
    "  ---",
    "    operator: fail",
    "    expected: 4",
    "    actual:   3",
    "  ...",
    "",
    "1..15",
  ];

  var p = parser();

  // works
  p.on('output', function (output) {
    t.deepEqual(output.fail[0].error.expected, 'you')
  })

  // does not work
  // p.on('assert', function (assert) {
  //   t.deepEqual(assert.error.expected, 'you')
  // });

  mockTap.forEach(function (line) {

    p.write(line + '\n');
  });
  p.end();
});

If you comment out that assertion you will get an error:

/projects/oss/tap-out/test/index.js:494
    t.deepEqual(assert.error.expected, 'you')
                            ^
TypeError: Cannot read property 'expected' of undefined

[mattdesl]

Hmm, thinking a bit more about this. Maybe it is the intended result, since by the time the parser reaches "assert" it still has no information about error. Maybe a solution would be:

• emit a different event when error has been parsed
• do not send an empty error object to the event of 'assert' to avoid confusion

Anyways, I'm going to render errors at the bottom of the console (after output) so this issue is no longer such a big deal. 😄

[scottcorgan]

I'll still investigate on the best way to handle this. Feel free to submit a PR if you get anxious.

[scottcorgan]

I'll go ahead and close this and we can revisit if it causes more issues for you.

[mattdesl]

k 👍