My Visualforce page is calling Controller methods using apex:actionFunction and are not being executed while I am implementing the test class. Also in my test class I have test contact records which are not being fetched by the SOSL query from the Controller causing other methods to not executed.

Main controller(partial):

public Contact cont {get;set;}
public List<Contact> relatedConsList {get;set;}
//Constructor 
 public ParentController(ApexPages.StandardController stdController){
    List<String> contactFields = new List<String>{'Name', 'Email'}; 
        if (!Test.isRunningTest()) stdController.addFields(contactFields); 
    this.cont=(Contact)stdController.getRecord();
        Contact currentCont = [Select Id, FirstName, LastName, Email FROM Contact WHERE Id =: cont.Id];
        relatedConsList = ParentControllerHelper.searchRelatedContacts(currentCont.FirstName, currentCont.LastName, currentCont.Id, currentCont.Email);
 }
 public List<contactWrapper> processConts(){
    if(contactList == null){
        contactList = new List<contactWrapper>();
        if(relatedConsList.size() > 0){
            System.debug('Related List not Empty: ' +relatedConsList);
            for(Contact c: relatedConsList){
                contactList.add(new contactWrapper(c));
            } 
        }
    }
    return contactList;
 }

Helper class(partial):

Public static List<Contact> searchRelatedContacts(String firstName, String lastName, String contId, String email){
    String searchTerm = '';
    
    if(firstName != null){
        if(lastName != null){
            searchTerm += '('+firstName+' AND '+lastName+')' ;
        } else {
            searchTerm += firstName;
        }
    } else {
        if(lastName != null) {
            searchTerm += lastName;
        }
    }
    List<Contact> relatedConsList = new List<Contact>();
    relatedConsList = [FIND :searchTerm 
                       IN ALL FIELDS
                       RETURNING Contact(
                           Name,Id,Email,Phone,MobilePhone
                           WHERE Email <> NULL AND Id <> :contId)][0]; 
    System.debug('After query: ' +relatedConsList); //Getting as Empty in test execution all the time
    return relatedConsList; 
}

Test class:

@testSetup static void setup() {
    
    List<Account> testAccts = new List<Account>();
    for(Integer i=0;i<2;i++) {
        testAccts.add(new Account(Name = 'TestAcct'+i));
    }
    insert testAccts;
    
    List<Contact> testConts = new List<Contact>();
    for (Integer i=0;i<10;i++){
        testConts.add(new Contact(FirstName = 'Test', MiddleName= 'M'+i,  LastName = 'lName', Email = '[email protected]'+i, AccountId=testAccts[0].Id));
    }
    
    testConts[4].AccountId = testAccts[1].Id; //Changing AccountId 
    testConts[5].AccountId = testAccts[1].Id; 
    testConts[6].AccountId = testAccts[1].Id; 
    testConts[7].AccountId = testAccts[1].Id; 
    
    insert testConts;
    System.debug('Testsetup: ' +testConts[0].Id);
    System.debug('Inserted Test Cons: ' +testConts);
}

@isTest
static void testMethodForCons(){
    
    Contact con = [Select Id, FirstName, LastName, Email FROM Contact LIMIT 1];
    List<Contact> testConsList = [SELECT Id, FirstName, LastName, Email 
                                  FROM Contact WHERE FirstName =: con.FirstName]; //I can query the test records. 
    Test.startTest();
        PageReference pr = Page.myVFPage;
        Test.setCurrentPageReference(pr);
        ApexPages.currentPage().getParameters().put( 'Id', con.Id );
        ApexPages.Standardcontroller sc = new ApexPages.Standardcontroller(con);
        ParentController ctrl = new ParentController(sc);
        ctrl.processConts(); //Not executing as SOSL not getting the test contacts list. 
    Test.stopTest();
    
}