@Nonnull
    @Override
    public ILogger getLogger(@Nonnull String name) {
        checkNotNull(name, "name must not be null");
        return getOrPutIfAbsent(mapLoggers, name, loggerConstructor);
    }
@Test
    public void testLog_whenGetLevel_thenDefaultLevelIsReturned() {
        ILogger logger = loggingService.getLogger("test");
        assertNotNull(logger.getLevel());
    }