v2: Missing test for promise.reject(error)

[AlfredJKwack]

Hi,

We need a test case for the promise being rejected.

The basic structure should follow something like the below. I'm also curious why the errorHandler source code returns a simple string and not an error object. What's the thinking on that?

const promise = new Promise((resolve, reject) => {
    reject(new Error("Something awful happened"));
});
promise.then((res) => {
    // This is never called
});
promise.catch((err) => {
    console.log('I get called:', err.message); // I get called: 'Something awful happened'
});

As always, looking for some insight here before I supply a pull request.

[briangonzalez]

Whoops. That's an oversight, and a test for the rejection case would be much welcomed :)

[AlfredJKwack]

Done.