I have a VF page and Controller Extension that allows me to clone a custom object (ProposalFlight__c) record. The ProposalFlight__c record has a lookup field to another custom object, called Geo__c. Using the VF page (which overrides the custom clone button) and the Controller Extension, I am able to clone both ProposalFlight__c and Geo__c at the same time. However, I'm really struggling with creating the unit test for the controller extension.

VF Page:

<apex:page standardController="ProposalFlight__c" extensions="ProposalFlightCloneExtension" 
    action="{!cloneRecord}">
    <apex:pageMessages />
</apex:page>

Controller Extension (I've replaced the fields that are actually in the queury with (all Fields) just to make it reasier to read here):

public class ProposalFlightCloneExtension{
    
    //Variable to hold current record
     ProposalFlight__c currentRecord;
     
     //Standard constructor method
     public ProposalFlightCloneExtension(ApexPages.StandardController controller){
         currentRecord = (ProposalFlight__c)controller.getRecord();
     } 
     
      public PageReference cloneRecord(){
         //Variable to hold the new record
         ProposalFlight__c newRecord;
         Savepoint sp = Database.setSavepoint();
         
         try{
         
             //first clone the Geo Record
             Geo__c clonedGeo;
             
             for(Geo__c relatedGeo: [SELECT (All Fields) FROM Geo__c WHERE Id in (SELECT Geo__c FROM ProposalFlight__c WHERE id=: currentRecord.id)]){
                 Geo__c newGeo = relatedGeo.clone(false);
                 clonedGeo = newGeo;
             } 
             insert clonedGeo;
             
             //now clone the Proposal Flight
             currentRecord = [SELECT (All Fields) FROM ProposalFlight__c WHERE id=:currentRecord.id];
             newRecord = currentRecord.clone(false);
             newRecord.ApprovalStatus__c = Status.NotSubmitted;
             newRecord.ClonedFrom__c = currentRecord.id;
             newRecord.Geo__c = clonedGeo.ID;
             newRecord.GeoTargetSummary__c = clonedGeo.Text__c;
             insert newRecord;

         }catch(Exception e){
             Database.rollback(sp);
             ApexPages.addMessages(e);
             return null;
         }
         
         return new PageReference('/'+newRecord.id);
     }

}

My Unit Test so far:

@isTest (SeeAllData = True)
private class Test_ProposalFlightCloneExtension{
    
    static testMethod void testProposalFlightClone(){
    
        //create test data
        Account acct = UnitTestFactory.makeAccount();
        Opportunity opp = UnitTestFactory.makeMasterCPMOpp(acct.id);
        ProposalFlight__c pf = UnitTestFactory.makeCPMPF(opp.id);
        Geo__c geo = [SELECT Id FROM Geo__c WHERE Id in (SELECT Geo__c FROM ProposalFlight__c WHERE Id =: pf.Id)];
        
        //Go to Page
        Test.setCurrentPage(Page.ProposalFlightClone);
        
        //Set Parameters that would be passed in
        ApexPages.currentPage().getParameters().put('Id', pf.Id);
        
        //Instantiate a new controller with all parameters in place
        ProposalFlightCloneExtension ext = new ProposalFlightCloneExtension(new ApexPages.StandardController(pf));
        
        PageReference pageRef = Page.ProposalFlightClone;

    
    }

}

 The unit test passes, but is only covering 12% of the class. It doesn't cover any of the actual cloning logic. If anyone could point me in the right direction I would really appreciate it. Thank you!