!property.present
        property.getOrNull() == null
        property.getOrElse(someValue()) == someValue()

        when:
        property.get()

        then:
        def e = thrown(MissingValueException)
        e.message == "Cannot query the value of ${displayName} because it has no value available."
    }

    def "toString() does not realize value"() {
        given: