### Question:
CompletableResultCode { public static CompletableResultCode ofSuccess() { return SUCCESS; } CompletableResultCode(); static CompletableResultCode ofSuccess(); static CompletableResultCode ofFailure(); static CompletableResultCode ofAll(final Collection<CompletableResultCode> codes); CompletableResultCode succeed(); CompletableResultCode fail(); boolean isSuccess(); CompletableResultCode whenComplete(Runnable action); boolean isDone(); CompletableResultCode join(long timeout, TimeUnit unit);  }### Answer:
@Test void ofSuccess() { assertThat(CompletableResultCode.ofSuccess().isSuccess()).isTrue(); }