@Test
    void verifyOperation() {
        val validator = SimpleUrlValidator.getInstance();
        assertTrue(validator.isValid("https://github.com"));
        assertTrue(validator.isValidDomain("www.github.com"));
        assertFalse(validator.isValid(null));
        assertFalse(validator.isValid(StringUtils.EMPTY));
    }
This is {@link SimpleUrlValidatorTests}.

@author Misagh Moayyed
@since 6.2.0
core/cas-server-core-web/src/test/java/org/apereo/cas/web/SimpleUrlValidatorTests.java