React\Promise\PromiseTest\RejectTestTrait::doneShouldThrowWithDeepNestingPromiseChains PHP Method

    public function doneShouldThrowWithDeepNestingPromiseChains()
    {
        $this->setExpectedException('\\Exception', 'UnhandledRejectionException');
        $exception = new \Exception('UnhandledRejectionException');
        $d = new Deferred();
        $result = \React\Promise\resolve(\React\Promise\resolve($d->promise()->then(function () use($exception) {
            $d = new Deferred();
            $d->resolve();
            return \React\Promise\resolve($d->promise()->then(function () {
            }))->then(function () use($exception) {
                throw $exception;
            });
        })));
        $result->done();
        $d->resolve();
    }