斯波克嘲笑的价值观不会延续到科特林？

Question

我有Kotlin课程和Groovy/Spock测试。当我模拟一个Kotlin类并在该模拟上设置一个属性值时，它无法传递到Kotlin。

下面是一个Kotlin实体类，以及一个使用它的类：

open class TestEntity(var prop: String) {

}

class AClassUnderTest {
    fun useATestEntity(testEntity: TestEntity) {
        System.out.println("Checking it isn't null within Kotlin code: " + (testEntity.prop))
        System.out.println("Code which assumes it is not null: " + testEntity.prop.length)
    }
}

class AClassUnderTestTest extends Specification {
    def "UseATestEntity"() {
        given:
        def cut = new AClassUnderTest()
        def testEntityMock = GroovyMock(TestEntity)
        testEntityMock.getProp() >> "abc"
        System.out.println("Checking it isn't null after mocking: " + (testEntityMock.prop))

        when:
        System.out.println("Checking it isn't null during when clause: " + (testEntityMock.prop))
        cut.useATestEntity(testEntityMock)

        then:
        noExceptionThrown()
    }
}

Checking it isn't null after mocking: abc
Checking it isn't null during when clause: abc
Checking it isn't null within Kotlin code: null

Expected no exception to be thrown, but got 'java.lang.NullPointerException'

已经尝试过：

• 使用GroovyStub（）而不是GroovyMock（）-没有区别
• 使用Mock（）/stub（）而不是GroovyMock（）-那么该属性在所有println的even Groovy（！！？）
• 模仿“testentitymock.prop>>”而不是“testentitymock.getprop()>>”-没有区别

Answer 1

已解决：属性本身也必须声明为打开：

open class TestEntity(
    open var prop: String  // <-- has to be declared open to be mockable!
) {

}