def action = Mock(Action)
        container.beforeCollectionChanges(action)

        when:
        container.add("a")

        then:
        1 * action.execute(null)
        0 * _
    }

    def objectIsNotAddedWhenVetoActionThrowsAnException() {
        def action = Mock(Action)
        def failure = new RuntimeException()
        container.beforeCollectionChanges(action)

        when:
        container.add("a")

        this.ownDependencies.beforeCollectionChanges(validateMutationType(this, MutationType.DEPENDENCIES));
        this.ownDependencyConstraints = (DefaultDomainObjectSet<DependencyConstraint>) domainObjectCollectionFactory.newDomainObjectSet(DependencyConstraint.class);
        this.ownDependencyConstraints.beforeCollectionChanges(validateMutationType(this, MutationType.DEPENDENCIES));