@Test
    public void testGetExtensionLoaderNoClassMatchSPI() {
        try {
            ExtensionLoader.getExtensionLoader(NoClassMatchSPI.class).getJoin("subNoClassMatchSPI");
            fail();
        } catch (IllegalStateException expected) {
            assertThat(expected.getMessage(), containsString("load extension resources error"));
        }
    }
test ExtensionLoader.getJoin() param name no class match case.
shenyu-spi/src/test/java/org/apache/shenyu/spi/ExtensionLoaderTest.java