public static Properties getResourceAsProperties(String resource) throws IOException {
        ClassLoader loader = ResourceUtils.class.getClassLoader();
        return getResourceAsProperties(loader, resource);
    }
@Test
    void testGetResourceAsPropertiesForClasspath() throws IOException {
        Properties properties = ResourceUtils.getResourceAsProperties("resource_utils_test.properties");
        assertNotNull(properties);
        assertTrue(properties.containsKey("a"));
    }