### Question:
RegisterAuthenticatorFactory implements RequiredActionFactory, DisplayTypeRequiredActionFactory { @Override public void postInit(KeycloakSessionFactory factory) { }  @Override RequiredActionProvider create(KeycloakSession session); @Override void init(Scope config); @Override void postInit(KeycloakSessionFactory factory); @Override void close(); @Override String getId(); @Override RequiredActionProvider createDisplay(KeycloakSession session, String displayType); @Override String getDisplayText(); static final String PROVIDER_ID; }### Answer:
@Test public void test_postInit() throws Exception { RegisterAuthenticatorFactory factory = new RegisterAuthenticatorFactory(); try { factory.postInit(null); } catch (Exception e) { Assert.fail(e.getMessage()); } }