@SuppressWarnings("unchecked")
    public static <T> Collection<T> getServiceInstances(final Class<T> serviceInterface) {
        return (Collection<T>) getRegisteredSPI(serviceInterface).getServiceInstances();
    }
@Test
    void assertGetServiceInstancesWithEmptyInstances() {
        assertTrue(ShardingSphereServiceLoader.getServiceInstances(EmptySPIFixture.class).isEmpty());
    }