Rx\Functional\React\PromiseToObservableTest::from_promise_failure PHP Method

    public function from_promise_failure()
    {
        $p = Promise::rejected(new Exception('error'));
        $source = Promise::toObservable($p);
        $source->subscribe(new CallbackObserver(function ($x) {
            $this->assertFalse(true);
        }, function ($error) {
            $this->assertEquals($error, new Exception('error'));
        }, function () {
            $this->assertFalse(true);
        }));
    }