order create with exception

OrderCreateFacadeTest.groovy

package io.happy.customer

import spock.lang.Specification

class OrderCreateFacadeTest extends Specification {

    def orderCommissionCalculator = Mock(OrderCommissionCalculator)
    def orderCreateFacade = new OrderCreateFacade(orderCommissionCalculator)

    void "should not create order when price is zero"() {
        given:
        def userId = 998
        def paymentMethod = "CARD"
        def price = 0

        and:
        1 * orderCommissionCalculator.calculate("CARD", 0) >> { throw new Exception("price could not be zero") }
        0 * _._

        when:
        orderCreateFacade.create(userId, paymentMethod, price)

        then:
        def e = thrown(Exception)
        e.message == "price could not be zero"
    }
}