Plugin create(Options.Plugin plugin) {
        try {
            return instantiate(plugin.pluginString(), plugin.pluginClass(), plugin.argument());
        } catch (IOException | URISyntaxException e) {
            throw new CucumberException(e);
        }
    }
@Test
    void instantiates_file_or_empty_arg_plugin_without_arg() {
        PluginOption option = parse(WantsFileOrEmpty.class.getName());
        WantsFileOrEmpty plugin = (WantsFileOrEmpty) fc.create(option);
        assertThat(plugin.out, is(nullValue()));
    }