when:
        property.setToConventionIfUnset()

        then:
        assertValueIs(['4'])

        when:
        property.unset()
        property.setToConventionIfUnset()

        then:
        assertValueIs(['1'])
        property.explicit
    }

    def "property is empty when setToConventionIfUnset if convention not set yet"() {
        when:

        when:
        property.setToConventionIfUnset()

        then:
        assertValueIs(['k1': '4'])

        when:
        property.unset()
        property.setToConventionIfUnset()

        then:
        assertValueIs(['k0': '1'])
        property.explicit
    }

    def "property is empty when setToConventionIfUnset if convention not set yet"() {
        when:

        collection.from as List == ["src1"]

        when:
        collection.setToConventionIfUnset()

        then:
        collection.from as List == ["src1"]

        when:
        collection.unset()

        then:
        assert !collection.explicit

        when:
        collection.setToConventionIfUnset()

        then:
        assert collection.explicit