@Test
public void testMissing() {

    try {
        ExtensionAdderProviders.findCachedProvider("Default",
                SimpleExtensionAdder.class, new ConcurrentHashMap<>(),
                new ConcurrentHashMap<>());
        fail("Should throw Missing Provider exception");
    } catch (PowsyblException e) {
        assertTrue("Should throw Missing Provider exception",
                e.getMessage().contains("not found"));
    }
}