@Test
    public void testGetExtensionLoaderCanNotInstantiatedSPI() {
        try {
            ExtensionLoader.getExtensionLoader(JdbcSPI.class).getJoin("canNotInstantiated");
            fail();
        } catch (IllegalStateException expected) {
            assertThat(expected.getMessage(), containsString(
                    "Extension instance(name: canNotInstantiated, class: class org.apache.shenyu.spi.fixture.CanNotInstantiatedSPI)"));
        }
    }
test ExtensionLoader.getJoin() param SPI class can not instantiated case.
shenyu-spi/src/test/java/org/apache/shenyu/spi/ExtensionLoaderTest.java