assert false: "never called"
        }))

        expect:
        propertyWithBadValue.toString() == "property(java.lang.String, map(java.lang.String provider(?) check-type()))"
        providerWithNoValue().toString() == "property(java.lang.String, undefined)"
    }

    def "can set null value to discard value"() {
        given:
        def property = property()
        property.set(someValue())