def "can add action to execute only when object removed"() {
        containerAllowsElementRemoval()

        def action = Mock(Action)

        addToContainer(c)

        when:
        container.whenObjectRemoved(action)

        then:
        // Does not fire for existing elements
        0 * action._

        when:
        addToContainer(a)
        container.remove(c)
        container.remove(a)

        def allArtifacts = master.allArtifacts

        def added = []
        allArtifacts.whenObjectAdded { added << it.name }
        def removed = []
        allArtifacts.whenObjectRemoved { removed << it.name }

        expect:
        allArtifacts.empty

        when:
        masterParent1.artifacts << artifact("p1-1")
        masterParent1Parent1.artifacts << artifact("p1p1-1")

Method <org.gradle.api.DomainObjectCollection.whenObjectRemoved(groovy.lang.Closure)> has arguments/return type groovy.lang.Closure that is not Gradle public API or primitive or built-in JDK classes or Kotlin classes in (DomainObjectCollection.java:0)