//for better debugging: set ini_set('precision', 17); 

class PrecisionTest extends WebTestCase
{
    private function buildForm() {
        $builder = $this->getContainer()->get('form.factory')->createBuilder(FormType::class, null, []);
        $form = $builder->add('money', MoneyType::class, [
            'divisor' => 100
        ])->getForm();
        return $form;
    }

    // high-level symptom
    public function testMoneyType() {
        $form = $this->buildForm();
        $form->submit(['money' => '12,34']);

        $data = $form->getData();

        $this->assertEquals(1234, $data['money']);
        $this->assertEquals(1234, (int)$data['money']);

        $form = $this->buildForm();
        $form->submit(['money' => '17,65']);

        $data = $form->getData();

        $this->assertEquals(1765, $data['money']);
        $this->assertEquals(1765, (int)$data['money']); //fails: data[money] === 1764 
    }

    //root cause
    public function testParsedIntegerPrecision() {

        $string = "17,65";
        $transformer = new MoneyToLocalizedStringTransformer(2, false,null, 100);
        $value = $transformer->reverseTransform($string);

        $int = (integer) $value;
        $float = (float) $value;

        $this->assertEquals(1765, (float)$float);
        $this->assertEquals(1765, $int); //fails: $int === 1764
    }
}