@Test
    public void testInitMissingServiceUrl() {
        val configuration = new CasConfiguration();
        configuration.setLoginUrl(LOGIN_URL);
        val client = new DirectCasProxyClient();
        client.setConfiguration(configuration);
        TestsHelper.expectException(client::init, TechnicalException.class, "serviceUrl cannot be blank");
    }
Tests the {@link DirectCasProxyClient}.

@author Jerome Leleu
@since 1.9.2
pac4j-cas/src/test/java/org/pac4j/cas/client/direct/DirectCasProxyClientTests.java