trigger userdeactive on User (before insert,before update) {
List<GroupMember> group = new List<GroupMember>([select Id, UserOrGroupId, groupid From GroupMember where groupId IN 
                                                 (SELECT id FROM group WHERE Type = 'Queue') 
                                                  AND UserOrGroupId IN (SELECT id from user WHERE isactive=FALSE)]);

   delete group;            
}

@isTest 
private class deActiveUserTest {
    static testMethod void validateremoveInActiveUser() {
       {
 User thisUser = [SELECT Id FROM User WHERE Id = :UserInfo.getUserId()];
      System.runAs (thisUser) 
      {        // Insert user
        Profile p = [SELECT Id FROM Profile WHERE Name='System Administrator']; 
        User u = new User(Alias = 'standt', Email='test@test.com', 
        EmailEncodingKey='UTF-8', LastName='Testing', LanguageLocaleKey='en_US', 
        LocaleSidKey='en_US', ProfileId = p.Id, 
        TimeZoneSidKey='America/Los_Angeles', UserName='sdss123@test.com');
        insert u;
        
        // Insert group
        Group grp = new Group();
        grp.Name = 'Technology Partner Content';
        insert grp;
        
        test.starttest();
         system.assertequals(u,[select id from user WHERE isactive=FALSE]);
         delete grp;
         test.stoptest();
 
        
        // Insert contact with your required field.
        Contact cnt = new Contact();
        cnt.LastName = 'Test contact';
        cnt.Email = 'test@test.com';
        //cnt.Public_Group_Technology_Partner_Content__c = true;
        insert cnt;
        }
    }
}
}