如何使用Grails 3.2.4设置Cucumber以使用Grails进行测试？

dependencies {
    // ...
    testCompile 'info.cukes:cucumber-core:1.2.5'
    testCompile 'info.cukes:cucumber-groovy:1.2.5'
    testCompile 'info.cukes:cucumber-junit:1.2.5'
}

import cucumber.api.groovy.EN

class CalculatorSteps implements EN {
    def result

    CalculatorSteps() {
        Given(~'^I have entered (\\d+) into the calculator$') { int number ->
            // 在这里编写测试步骤的实现
        }

        When(~'^I press add$') {
            // 在这里编写测试步骤的实现
        }

        Then(~'^the result should be (\\d+) on the screen$') { int expected ->
            // 在这里编写测试步骤的实现
        }
    }
}

Feature: Calculator
  Scenario: Addition
    Given I have entered 5 into the calculator
    When I press add
    Then the result should be 10 on the screen

grails test-app --stacktrace --verbose cucumber:1.2.5