Asynchronous tests are broken about utest HOT 5 OPEN

I agree this should work. The issue is not only the Timer implementation but also utest does not take thread safety into account at all.
As a temporary solution you could shadow haxe.Timer module with your own implementation, and maybe it would be enough for your case. But it's also possible you would face random test failures due to races.

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Another solution is to modify tests like this:

  function testBar(async: utest.Async) {
    var thread = Thread.current();
    veryComplexFunctionToBeTested(() -> {
      thread.events.run(() -> {
        utest.Assert.pass();
        async.done();
      });
    });
  }

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Thank you for your comments.
Currently I have resorted to a solution similar to that outlined in your last comment.
Regarding your first comment, how can I shadow a standard library class with my implementation?

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Just create a class with the same package and name in your project.

from utest.

Maybe not related to this, but also probably is, so I didn't want to open a new issue: async in setupClass blocks even after async.done() has been called, but only if it's been called from a Timer or Thread callback.

For example, running this test:

class TestSmoke extends utest.Test {

    function setupClass( async : utest.Async ) {
        trace('setup');

        sys.thread.Thread.current().events.run(()->{
            async.done();
            trace('delay done');
        });
        // haxe.Timer.delay(()->{
        //     async.done();
        //     trace('delay done');
        // },50);
    }

    function teardownClass() {
        trace('teardown');
    }

    function testSmoke() {
        utest.Assert.fail();
    }
}

will not fail as expected, instead it will just hang forever:

src/test/TestSmoke.hx:12: setup
src/test/TestSmoke.hx:25: teardown
src/test/TestSmoke.hx:16: delay done

Thread.current.events and Timer.delay give the same result (test execution hangs) on macro, neko and hl targets (haven't tried others).

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