@Override
    protected String getCallbackUrl() {
        return "http://localhost:8080/callback?client_name=" + SAML2Client.class.getSimpleName();
    }
This is {@link SAML2AuthnRequestBuilderTests}.

@author Misagh Moayyed
@since 4.0.0
pac4j-saml/src/test/java/org/pac4j/saml/sso/impl/SAML2AuthnRequestBuilderTests.java