def "knows registered extensions"() {
        when:
        container.add("foo", extension)
        container.add("bar", barExtension)

        then:
        container.getByName("foo") == extension
        container.findByName("bar") == barExtension

        container.getByType(BarExtension) == barExtension
        container.findByType(FooExtension) == extension

        container.findByType(SomeExtension) == null