### Question:
RegisterAuthenticator implements RequiredActionProvider { @Override public void close() { } RegisterAuthenticator(KeycloakSession session); @Override void close(); @Override void evaluateTriggers(RequiredActionContext context); @Override void requiredActionChallenge(RequiredActionContext context); @Override void processAction(RequiredActionContext context);  }### Answer:
@Test public void test_close() throws Exception { try { authenticator.close(); } catch (Exception e) { Assert.fail(e.getMessage()); } }