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kotlinlang

Sorry to mention you <@U2E974ELT> but don’t you have an idea of how to do that?

What is that thenable promise that qunit needs? Why would a regular JS Promise not work? 

`QUnit.test() can automatically handle the asynchronous resolution of a Promise on your behalf if you return a thenable Promise as the result of your callback function.`

I think it’s here: <https://github.com/qunitjs/qunit/blob/7dacb5e31ea62e156f207a5511bcb648104da15f/src/test.js#L495-L498>

Qunit needs a `then` function on the promise.

And JS Promise has one: <https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/then>

When I run this code: 
```
    @Test
    fun testPromise(): Promise&lt;String&gt; =
        promise {
            delay(1000)
            assertTrue(true)
            "OK"
        }
```
The result captured by qunit as `promise` is of type Unit and `promise.then` is undefined which causes the problem.

When I do some plain javascript test (working): 
```
QUnit.test( "a Promise-returning test", function( assert ) {
    return new Promise(function (resolve, reject) {
        setTimeout(function () {
            assert.ok(true);
            resolve("result");
        }, 1500);
    });
});
```
`promise` is a Promise object with `then` defined as a function.

Ok, I think I found the bug. It’s on FrameworkAdapter: <https://github.com/JetBrains/kotlin/blob/e43a145614220fb0d2f596fb19ce28092965e794/libraries/kotlin.test/js/src/main/kotlin/kotlin/test/FrameworkAdapter.kt#L52>
The signature of `testFn` should be `()-&gt;Any` to give back the result of the test function call to Qunit, allowing it to manage an potential Promise.

Would you submit <http://kotl.in/issue>, please

Yes done: <https://youtrack.jetbrains.com/issue/KT-22807>