}

    def "shallow copy does not inherit producer from the original"() {
        given:
        def task = Mock(Task)
        def property = propertyWithNoValue()
        property.attachProducer(owner(task))

        expect:
        assertHasNoProducer(property.shallowCopy())
    }

    def "shallow copy reflects changes to the value"() {
        given:

        if (displayName == null) {
            return DEFAULT_VALIDATION_DISPLAY_NAME;
        }
        return displayName;
    }

    @Override
    public void attachProducer(ModelObject owner) {
        if (this.producer == null) {
            this.producer = owner;
        } else if (this.producer != owner) {
            TreeFormatter formatter = new TreeFormatter();

        property.addAll(supplierWithProducer(task2))
        property.add(supplierWithProducer(task3))

        expect:
        assertHasProducer(property, task1, task2, task3)

        property.attachProducer(owner(producer))
        assertHasProducer(property, producer)
    }

    def "cannot set to empty list after value finalized"() {
        given:
        def property = property()

        property.putAll(supplierWithProducer(task2))
        property.put('a', supplierWithProducer(task3, '1'))

        expect:
        assertHasProducer(property, task1, task2, task3)

        property.attachProducer(owner(producer))
        assertHasProducer(property, producer)
    }

    def "cannot set to empty map after value finalized"() {
        given:
        property.set(someValue())