return false
            }
        }

        container.add("a")

        expect:
        container.matching(spec).empty
    }

    def canGetFilteredCollectionContainingAllObjectsWhichMeetSpec() {
        def spec = new Spec<CharSequence>() {
            boolean isSatisfiedBy(CharSequence element) {
                return element != "b"
            }
        }

        Spec<Bean> spec = {false} as Spec<Bean>

        when:
        container.add(new Bean("a"));

        then:
        container.matching(spec).empty
    }

    def canGetFilteredCollectionContainingAllObjectsWhichMeetSpec() {
        Bean bean1 = new Bean("a");
        Bean bean2 = new Bean("b");
        Bean bean3 = new Bean("c");

        when:
        Spec<Bean> spec = { it != bean1 } as Spec<Bean>