public function testMultiplication()
{
$money = Money::fromAmount('100', Currency::fromCode('EUR'));
$expected1 = Money::fromAmount('200', Currency::fromCode('EUR'));
$expected2 = Money::fromAmount('101', Currency::fromCode('EUR'));
$this->assertTrue($money->multiplyBy(2)->equals($expected1));
$this->assertTrue($money->multiplyBy('1.01')->equals($expected2));
$this->assertNotSame($money, $money->multiplyBy(2));
}