Allow custom validation function for reject

[kanongil]

The new await reject that helps test promise rejections only supports two specific validation methods on the returned error.

It would be much more useful, if it can support additional custom validation, either through a callback, or by returning the error.

Example:

await expect(somePromise).to.reject((err) => {

    expect(err.isBoom).to.exist();
});

Alternatively:

const err = await expect(somePromise).to.reject();
expect(err.isBoom).to.exist();

This mode looks cleaner, but is a bit weird, since it requires reject to resolve with the error.

[hueniverse]

I had the same thought as I was rewriting the tests and had to use try...catch instead of an assertion where the test needed extra checks. I'll add this today. I'm going to go with the second.

[lock]

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