@Test
    void verifyOperation() {
        Arrays.stream(SubjectDnPrincipalResolverProperties.SubjectDnFormat.values()).forEach(opt -> {
            val results = X509AuthenticationUtils.getSubjectDnFormat(opt);
            if (opt != SubjectDnPrincipalResolverProperties.SubjectDnFormat.DEFAULT) {
                assertNotNull(results);
            } else {
                assertNull(results);
            }
        });
    }
This is {@link X509AuthenticationUtilsTests}.

@author Misagh Moayyed
@since 6.4.0
support/cas-server-support-x509-core/src/test/java/org/apereo/cas/adaptors/x509/util/X509AuthenticationUtilsTests.java