### Question:
TitlecaseLambda implements Mustache.Lambda { private String titleCase(final String input) { return input.substring(0, 1).toUpperCase(Locale.ROOT) + input.substring(1); } TitlecaseLambda();  TitlecaseLambda(String delimiter); @Override void execute(Template.Fragment fragment, Writer writer);  }### Answer:
@Test public void titlecaseTest() { Map<String, Object> ctx = context("titlecase", new TitlecaseLambda()); test("Once Upon A Time", "{{#titlecase}}once upon a time{{/titlecase}}", ctx); }