Mapper { @VisibleForOverride protected Command<R> execution(CommandNode<T> command) { return (Command<R>) NONE; }  CommandNode<R> map(CommandNode<T> command); static final Command<?> NONE; static final Predicate<?> TRUE; static final SuggestionProvider<?> EMPTY; }
@Test void execution() throws CommandSyntaxException { assertEquals(0, mapper.execution(null).run(null)); }