spock test with bdd style

OrderCommissionCalculatorTestWithBDDStyle.groovy

class OrderCommissionCalculatorTest extends Specification {

    def orderCommissionCalculator = new OrderCommissionCalculator()

    void "should calculate card payment order commission"() {
        given: "card payment and price is 100"
        def paymentType = "CARD"
        def price = 100

        when: "calculate card payment commission"
        def commissionAmount = orderCommissionCalculator.calculate(paymentType, price)

        then: "commission should equal to 2.3"
        commissionAmount == 2.3
    }
}