I have the following code in my constructor method in apex class.

public Page4Controller() {

  User currentUser = [SELECT contactId  FROM User WHERE Id = :UserInfo.getUserId()];
        System.debug('Current user' + currentUser);
         //Fetch the current contact object
       if(String.isNotBlank(currentUser.ContactId)) {

            contact  = [
                SELECT  AccountId, firstName, lastName, MiddleName,  Nickname__c, Suffix, MailingStreet, MailingCity,
                MailingStateCode, Certify_Complete_and_Correct__c,  Certify_Download_Instructions_to_PreCan__c
                FROM Contact
                WHERE Id = :currentUser.ContactId
                LIMIT 1
            ];

            System.debug('contact information: ' + contact );

             //Fetch the current application object  
           application = [
                        
                        SELECT Id, Contact__c, Attend_College_after_High_School__c
                        FROM Application__c 
                        WHERE Contact__c =: currentUser.contactId
                        LIMIT 1];
            
                        
              }
}
And the following submit method

public pagereference submit() {
        
        if (
             contact.Certify_Complete_and_Correct__c == false ||
             contact.Certify_Download_Instructions_to_PreCan__c == false
                      
           ) 
        
              {
                 ApexPages.Message myMsg = new ApexPages.Message(ApexPages.Severity.ERROR, 'Please make sure all required fields are populated.');
                 ApexPages.addMessage(myMsg);
                 return null;
              }
        
       
                
        // ALO Code
        
         
         if(application.Attend_College_after_High_School__c == 'No')
         
            {
            
                acc = [
                        
                        SELECT Id, OwnerId
                        FROM Account
                        WHERE Id =: contact.AccountId
                        ];
                        
                
                contact.ALO__c = acc.OwnerId;
            
                        
              }
              
              
              
          else if(application.Attend_College_after_High_School__c == 'Yes')
          
              {
          
                  
                                 
                  ziptoLOD = [
                        
                        SELECT Id, Name, LOD__c
                        FROM Zip_3_to_LOD__c
                        WHERE Name =: contact.Extract_Zipcode__c
                        
                        ];
                        
                
                        
                  contact.ALO__c = ziptoLOD.LOD__c;
          
                      
             }
              
I don't know how to write test cases for the above conditions so that it covers both the if and else code.

Here is the test class I am working on

static testMethod void submit_Test() {

    Profile AdminProfile = [select id from profile where name='System Administrator']; 
    UserRole AdminRole = [SELECT id from UserRole where name = 'Admin'];


    User currentuser = new User();
      currentuser.firstname      ='James';
      currentuser.lastname      ='Dobb';
      currentuser.email         ='abcdefg@gmail.com';
      currentuser.username      ='abcdefg@gmail.com';
      currentuser.alias        ='jdobb';
      currentuser.TimeZoneSidKey  ='GMT';
      currentuser.LocaleSidKey    ='en_US';
      currentuser.emailencodingkey  ='UTF-8';
      currentuser.languagelocalekey  ='en_US';
      currentuser.ProfileId     = AdminProfile.Id;
      currentuser.userroleid     = AdminRole.Id;
      insert currentuser;
      
    
     Account acc= new Account();
     acc.OwnerId='005r0000001i9xA';
     acc.Name='Atlanta Area Tech School';
     acc.RecordTypeId='012r00000005DsA';
     
     
     Zip_3_to_LOD__c zip= new Zip_3_to_LOD__c();
     zip.Name = '480';
     zip.LOD__c = '005t0000001LDpi';
    
    Contact contact   = new Contact(); 
    contact.firstName = 'Alex';
    contact.lastName  = 'Cauller';
    contact.email     = 'alexcauller@gmail.com';
    contact.AccountId = acc.Id;
    
    
        
    system.runas(currentuser){
      insert acc;
      insert contact;
      insert zip;

      
    }
    
    
      
    Application__c app= new Application__c();
    app.Contact__c = contact.Id;
    app.Attend_College_after_High_School__c= 'No';
    
    
    system.runas(currentuser){
      
      insert app;
    }

    Profile pr = [select id from profile where name='......']; 
    User u = new User();
      u.firstname      ='James';
      u.lastname      ='Dobb';
      u.email         ='xyz@gmail.com';
      u.username      ='xyz@gmail.com';
      u.alias        ='jdobb';
      u.TimeZoneSidKey  ='GMT';
      u.LocaleSidKey    ='en_US';
      u.emailencodingkey  ='UTF-8';
      u.languagelocalekey  ='en_US';
      u.ProfileId     = pr.Id;
      u.contactId      =contact.id;
    insert u;

    system.runAs(u){
      System.Test.startTest();
      Page4Controller controllerClass = new Page4Controller();
      controllerClass.contact.Certify_Complete_and_Correct__c = false;
      controllerClass.contact.Certify_Download_Instructions_to_PreCan__c = false;
      controllerClass.submit();
      System.AssertEquals(controllerClass.contact.ALO__c,acc.OwnerId);
      controllerClass.application.Attend_College_after_High_School__c = 'Yes';
      controllerClass.submit();
      System.AssertEquals(controllerClass.contact.ALO__c,zip.LOD__c);
      controllerClass.previouspage();
      System.Test.stopTest();
      
           
    }
    
    
    When I run the test case, the test case fails and generates the following error on both the assert statements

System.AssertException: Assertion Failed: Expected: null, Actual: 005r0000001i9xAAAQ

    
    
    

    
  }