Легче ли тестировать код с Dependency Injection

class OrderProcessor:
    def process(self, order):
        payment_gateway = PaymentGateway()  # Жесткая зависимость
        payment_gateway.charge(order.total)

class OrderProcessor:
    def __init__(self, payment_gateway):
        self.payment_gateway = payment_gateway  # Внедрение зависимости
    
    def process(self, order):
        self.payment_gateway.charge(order.total)

def test_order_processor():
    mock_gateway = Mock()
    processor = OrderProcessor(mock_gateway)
    order = Order(total=100)
    processor.process(order)
    mock_gateway.charge.assert_called_with(100)