Hi!
Please help me to write negative and positive tests for two methods:

 @AuraEnabled
    public static void deleteContact(Id recordId) {   
        List<Contact> contact = 
        [SELECT Id FROM Contact WHERE Id = :recordId];
        delete contact;   
   }
    
    @AuraEnabled
    public static void addContact() {
        Contact contact = new Contact();
            try {
                insert contact;
            } catch (exception ex) {
                throw new auraHandledException(ex.getMessage());
            }
    }   

I tried, but it turns out something terrible...
@isTest
    public static void deleteContact_success_deletedContactById() { 
        Contact newContact = new contact(LastName = 'Bab');
        insert newContact;
        
        System.debug('newContact:' + newContact);
      
        List<Contact> deletedContact = 
        [SELECT Id FROM Contact WHERE LastName = 'Bab'];
        
        System.debug('deletedContact:' + deletedContact);
        
        delete deletedContact;

        Test.startTest();    
        List<Contact> Contact = ContactTableProjectSecond.deleteContact(recordId);
        Test.stopTest();     

        System.assertEquals(deletedContact, contact, 'Contacts not searched'); 
   }
    
    @isTest
    public static void addContact_success_addedContact() {               
        Contact newContact = new contact(LastName = 'Sam');
        insert newContact;
        List<Contact> addedContact = [SELECT Id, LastName FROM Contact WHERE LastName = 'Sam'];    
        
        System.debug('addedContact:' + addedContact); 
                
        Test.startTest();    
        List<Contact> contact = ContactTableProjectSecond.addContact();        
        Test.stopTest();  
        
        System.debug('contact:' + contact); 
        
        System.assertEquals(contact, addedContact, 'Contact not added');        
    }