Hi,
I am getting 41% code coverage in my apex controller.

public class ContactTaskOnApplication {
    
    @AuraEnabled
    public static List<Task> getContactTask(Id recordId,String contactAPIName){
        
        if(recordId==null || contactAPIName==null){
            return null;     
        }
        String sObjName = recordId.getSObjectType().getDescribe().getName();
        string query='SELECT Id, ' +contactAPIName+ ' FROM '+sObjName+ ' WHERE Id=:recordId';
        List<sObject> sObjectList=database.query(query);
        
        system.debug('sObjectList ' +sObjectList);
        
        if (!sObjectList.isEmpty()){
            id contactId=(Id)sObjectList[0].get(contactAPIName);
            List<Task> tsk=[SELECT Id,Subject,Priority,ActivityDate,Due_Date__c,
                            whoId FROM task WHERE whoId=:contactId];
            system.debug('tsk '+tsk);
            return tsk;
        }
        return null;
    }
    
}

Test class
====
@isTest
public class TestContactTaskOnApplication {
    
    public static Account partnerAccount;
    public static Contact studentContact;
    public static Application__c application;
    public static RFI__c rfi;
    public static Task task;
    
    static testmethod void testContactTaskOnApplicationMethod() {
        try{
            Id idRecordId = Schema.SObjectType.Account.getRecordTypeInfosByDeveloperName().get('Educational_Institution').getRecordTypeId();
            
            //Insert Account
            partnerAccount = new Account(Name='Gwendwyr Test', RecordTypeId=idRecordId);
            insert partnerAccount;
            
            //Insert Contact
            studentContact = new Contact(LastName='Someguy', firstname='Someguy' , email='test@test.com',hed__Citizenship__c='Canada');  
            insert studentContact;
            
            //Insert Application
            application=new Application__c(Contact__c=studentContact.id,Partner_Account_Application__c=partnerAccount.id);
            insert application;
            
               //Insert RFI
                rfi= new RFI__c (Email__c='testrfi@somerfi.com',Last_Name__c='Test RFI',First_Name__c='Test RFI',Contact__c=studentContact.id );
                insert rfi;
            
            //Insert Task
            task=new Task(Subject='Call',whoId=studentContact.id,ActivityDate=system.today(),Priority ='Normal',Due_Date__c=system.today()-1);
            insert task;
           
            ContactTaskOnApplication.getContactTask(application.id,application.Contact__c);
            ContactTaskOnApplication.getContactTask(rfi.id,rfi.Contact__c);
            
            //application.id, application.Contact__c
        }
        catch(exception e){
            
        }
        
    }
}