@Test
public void testIsVirtualDomain() {

    
    assertTrue(zms.isVirtualDomain("user.user1"));
    assertTrue(zms.isVirtualDomain("user.user2"));
    assertTrue(zms.isVirtualDomain("user.user1.sub1"));
    assertTrue(zms.isVirtualDomain("user.user1.sub2.sub3"));
    
    assertFalse(zms.isVirtualDomain("user"));
    assertFalse(zms.isVirtualDomain("usertest"));
    assertFalse(zms.isVirtualDomain("coretech.api"));
}