public static Properties loadProperties(Set<ClassLoader> classLoaders, String fileName) {
        return loadProperties(classLoaders, fileName, false, false);
    }
@Test
    void testLoadPropertiesOneFileNotRootPath() throws Exception {
        Properties p = ConfigUtils.loadProperties(
                Collections.emptySet(), "META-INF/dubbo/internal/org.apache.dubbo.common.threadpool.ThreadPool", false);

        Properties expected = new Properties();
        expected.put("fixed", "org.apache.dubbo.common.threadpool.support.fixed.FixedThreadPool");
        expected.put("cached", "org.apache.dubbo.common.threadpool.support.cached.CachedThreadPool");
        expected.put("limited", "org.apache.dubbo.common.threadpool.support.limited.LimitedThreadPool");
        expected.put("eager", "org.apache.dubbo.common.threadpool.support.eager.EagerThreadPool");

        assertEquals(expected, p);
    }