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

    public function from_promise_success()
    {
        $p = Promise::resolved(42);
        $source = Promise::toObservable($p);
        $source->subscribe(new CallbackObserver(function ($x) {
            $this->assertEquals(42, $x);
        }, function ($error) {
            $this->assertFalse(true);
        }, function () {
            $this->assertTrue(true);
        }));
    }