container.add "cat", new Thing("gizmo")
        container.add "meo", container.instanceGenerator.newInstance(Thing, "w")

        def schemaMap = container.extensionsSchema.collectEntries { [it.name, it.publicType] }
        expect:
        schemaMap == [ext: typeOf(ExtraPropertiesExtension),
                      foo: typeOf(Parent),
                      bar: typeOf(Capability),