验证Kotlin功能是否为unittest中的参数

Question

我正在尝试在单元测试中验证参数中的kotlin功能，但是失败了。这是我的代码

单元测试：

verify(moveToNextStepUseCase).execute(validateStepAssemblyUseCase.validate(ID),
                { view.showCompleteAssemblyConfirmDialog(type) },
                { view.showCompleteAssemblyErrorDialog() })

我的moveToNextStepUseCase代码：

interface MoveToNextStepUseCase {
    fun execute(validator: () -> Observable<Boolean>, successAction: () -> Unit, errorAction: () -> Unit)
}

我的呼叫代码：

moveToNextStepUseCase.execute(
                                        validateStepAssemblyUseCase.validateMissingAssembly(assignmentId),
                                        { view.showCompleteAssemblyConfirmDialog(currentStepId) },
                                        { view.showCompleteAssemblyErrorDialog() }
                                )

但是运行测试后出现错误：

Argument(s) are different! Wanted:
moveToNextStepUseCase.execute(
    Function0<io.reactivex.Observable<java.lang.Boolean>>,
    (move next assembly step incomplete case$1) Function0<kotlin.Unit>,
    (move next assembly step incomplete case$2) Function0<kotlin.Unit>
);

Actual invocation has different arguments:
moveToNextStepUseCase.execute(
    Function0<io.reactivex.Observable<java.lang.Boolean>>,
    () Function0<kotlin.Unit>,
    () Function0<kotlin.Unit>
);

谁知道为什么在实际调用中该参数为空？ ()