Spock – 使用数据表测试异常

示例：具有可以使用不同消息抛出异常的方法validateUser，如果用户有效则没有异常。

规范类本身：

class User { String userName }

class SomeSpec extends spock.lang.Specification {

    ...tests go here...

    private validateUser(User user) {
        if (!user) throw new Exception ('no user')
        if (!user.userName) throw new Exception ('no userName')
    }
}

变式1

这一个是工作，但真正的意图是凌乱的所有when / then标签和validateUser(用户)的重复调用。

def 'validate user - the long way - working but not nice'() {
        when:
        def user = new User(userName: 'tester')
        validateUser(user)

        then:
        noExceptionThrown()

        when:
        user = new User(userName: null)
        validateUser(user)

        then:
        def ex = thrown(Exception)
        ex.message == 'no userName'

        when:
        user = null
        validateUser(user)

        then:
        ex = thrown(Exception)
        ex.message == 'no user'
    }

变式2

这个不工作，因为Spock在编译时引发的错误：

异常条件只允许在’then’块中

def 'validate user - data table 1 - not working'() {
        when:
        validateUser(user)

        then:
        check()

        where:
        user                         || check
        new User(userName: 'tester') || { noExceptionThrown() }
        new User(userName: null)     || { Exception ex = thrown(); ex.message == 'no userName' }
        null                         || { Exception ex = thrown(); ex.message == 'no user' }
    }

变式3

这个不工作，因为Spock在编译时引发的错误：

异常条件仅允许作为顶级语句

def 'validate user - data table 2 - not working'() {
        when:
        validateUser(user)

        then:
        if (expectedException) {
            def ex = thrown(expectedException)
            ex.message == expectedMessage
        } else {
            noExceptionThrown()
        }

        where:
        user                         || expectedException | expectedMessage
        new User(userName: 'tester') || null              | null
        new User(userName: null)     || Exception         | 'no userName'
        null                         || Exception         | 'no user'
    }