@Test
public void test_getExtensionLoader_NotInterface() throws Exception {

    try {
        ExtensionLoader.getExtensionLoader(ExtensionLoaderTest.class);
        fail();
    } catch (IllegalArgumentException expected) {
        assertThat(expected.getMessage(),
                containsString("type(com.alibaba.cooma.ExtensionLoaderTest) is not interface"));
    }
}