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_custom_string_arg_plugin() {
        PluginOption option = parse(WantsString.class.getName() + ":hello");
        WantsString plugin = (WantsString) fc.create(option);
        assertThat(plugin.arg, is(equalTo("hello")));
    }