@Test
    void checkDefaultAccountRegistry() {
        val handler = getHandler(YubicoClient.getClient(CLIENT_ID, SECRET_KEY));
        assertNotNull(handler.getRegistry());
    }
Test cases for {@link YubiKeyAuthenticationHandler}.

@author Misagh Moayyed
@since 4.1
support/cas-server-support-yubikey/src/test/java/org/apereo/cas/adaptors/yubikey/YubiKeyAuthenticationHandlerTests.java