test ads unity

i have my app effectively ready to be released its all fine but one problem, im not sure if the ads work so to confirm if they do i need help. How can i edit my code to make it so test ads work on the unity editor just to confirm. I want this for banner and regular ads.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using GoogleMobileAds.Api;
 
 public class AdMobManager : MonoBehaviour
 {
 
 
     private BannerView bannerView;
     bool showAd;
 
     [SerializeField]
     private string appID = 
 
     [SerializeField] private string bannerID = 
     [SerializeField] private string regularAD = 
     void Start()
     {
         StartCoroutine("Timer");
     }
 
     IEnumerator Timer()
     {
         while (true)
         {
             yield return new WaitForSeconds(240.0f);
             showAd = true;
             while (showAd)
             {
                 yield return new WaitForEndOfFrame();
             }
         }
     }
 
     public void OnClickShowBanner()
     {
         if (showAd)
         {
             this.RequestBanner();
         }
     }
 
     public void OnClickShowAd()
     {
         if (showAd)
         {
             this.RequestRegularAD();
         }
     }
 
     private void RequestRegularAD()
     {
         InterstitialAd AD = new InterstitialAd(regularAD);
 
         AdRequest request = new AdRequest.Builder().Build();
 
         AD.LoadAd(request);
 
         showAd = false;
     }
 
 
     private void RequestBanner()
     {
         bannerView = new BannerView(bannerID, AdSize.Banner, AdPosition.Bottom);
 
         AdRequest request = new AdRequest.Builder().Build();
 
         bannerView.LoadAd(request);
 
         showAd = false;
     }
 }