@Test
public void testDomainNameValidationValid() {

    
    assertTrue(Validate.domainName("55"));
    assertTrue(Validate.domainName("3com.gov"));
    assertTrue(Validate.domainName("domain"));
    assertTrue(Validate.domainName("domain.sub.sub"));
    assertTrue(Validate.domainName("domain_"));
    assertTrue(Validate.domainName("_"));
    assertTrue(Validate.domainName("_test._"));
    assertTrue(Validate.domainName("sub1_sub2"));
    assertTrue(Validate.domainName("sub1_sub2_sub3"));
    assertTrue(Validate.domainName("sub1_sub2.sub3_sub4"));
    assertTrue(Validate.domainName("sub1_sub2_.sub3_sub4_"));
    assertTrue(Validate.domainName("sub1_sub2_.sub3_sub4_-"));
    assertTrue(Validate.domainName("domain-part"));
    assertTrue(Validate.domainName("com-test.gov"));
}