given:
        def task = expectTaskCreated(TaskWithNestedBeanWithPrivateClass, [existingFile, null] as Object[])

        when:
        execute(task)

        then:
        def e = thrown WorkValidationException
        validateException(task, false, e,
            missingValueMessage { type(TaskWithNestedBeanWithPrivateClass.canonicalName).property('bean.inputFile').includeLink() },