@Test
    public void testGetExtensionLoaderNonentitySPIName() {
        try {
            ExtensionLoader.getExtensionLoader(JdbcSPI.class).getJoin("nonentitySPIName");
            fail();
        } catch (IllegalArgumentException expected) {
            assertThat(expected.getMessage(), containsString("name is error"));
        }
    }
test ExtensionLoader.getJoin() param nonentity SPI name case.
shenyu-spi/src/test/java/org/apache/shenyu/spi/ExtensionLoaderTest.java