### Question:
Loggers { public static Logger empty() { return EMPTY_LOGGER; } private  Loggers(); static Logger empty(); static Logger verboseLogger(); static Logger infoLogger(); static Logger warningLogger();  }### Answer:
@Test public void loggersReturnsEmptyInstance() { Logger logger = Loggers.empty(); assertThat(logger, instanceOf(EmptyLogger.class)); }
@Test public void emptyLoggerReturnsSameInstance() { Logger logger1 = Loggers.empty(); Logger logger2 = Loggers.empty(); assertThat(logger1, sameInstance(logger2)); }