@Override
    PropertyInternal<T> providerWithValue(T value) {
        return propertyWithNoValue().value(value)
    }

    @Override
    PropertyInternal<T> providerWithNoValue() {
        return propertyWithNoValue()
    }

    /**
     * Returns a property with _no_ value.
     */
    abstract PropertyInternal<T> propertyWithNoValue()

    @Override
    String getDisplayName() {
        return "this property"

    AbstractCollectionProperty<String, C> propertyWithDefaultValue() {
        return property()
    }

    @Override
    AbstractCollectionProperty<String, C> propertyWithNoValue() {
        def p = property()
        p.set((List) null)
        return p
    }

    @Override
    C someValue() {
        return toMutable(["s1", "s2"])
    }

    @Override

    DefaultMapProperty<String, String> property() {
        new DefaultMapProperty<String, String>(host, String, String)
    }

    @Override
    DefaultMapProperty<String, String> propertyWithNoValue() {
        def p = property()
        p.set((Map) null)
        return p
    }

    @Override
    Class<Map<String, String>> type() {
        return Map
    }

    @Override