public static Properties loadProperties(Set<ClassLoader> classLoaders, String fileName) {
        return loadProperties(classLoaders, fileName, false, false);
    }
@Test
    void testLoadPropertiesOneFileAllowMulti() throws Exception {
        Properties p = ConfigUtils.loadProperties(Collections.emptySet(), "properties.load", true);

        Properties expected = new Properties();
        expected.put("a", "12");
        expected.put("b", "34");
        expected.put("c", "56");

        assertEquals(expected, p);
    }