expect:
        assertHasKnownProducer(property)
        def value = property.calculateExecutionTimeValue()
        value.hasFixedValue()
        !value.hasChangingContent()
        value.getFixedValue().isEmpty()
    }

    def "has no producer and missing execution time value when element provider with no value added"() {
        given:

        expect:
        assertHasKnownProducer(property)
        def value = property.calculateExecutionTimeValue()
        value.hasFixedValue()
        !value.hasChangingContent()
        value.getFixedValue().isEmpty()
    }

    def "has no producer and missing execution time value when element provider with no value added"() {
        given:
        property.addAll("a", "b")

        property.set(someValue())

        expect:
        assertHasNoProducer(property)
        def value = property.calculateExecutionTimeValue()
        value.hasFixedValue()
        !value.hasChangingContent()
        value.getFixedValue() == someValue()
    }

    def "can attach a producer task to property"() {
        def task = Mock(Task)
        def property = propertyWithNoValue()