meta class test for EMC overwriting potentially existing meta class

gistfile1.groovy

            def list = []

            try {
                list.noSuchMethod()
                assert false
            } catch (MissingMethodException mme) {
                assert true
            }

            ExpandoMetaClass.enableGlobally()
            List.metaClass.methodMissing = { String name, args ->
                true
            }
            assert list.noSuchMethod()