Hi, 
 I Created a class for Future callout and trying to create a Test Class for the same. I am invoking this class through an invokeable Apex class which gets called via a process builder. I tested this in Sandbox and it works pefect but i am not sure how to write the test class and migrate it. Below is the entire code, i am not sure , i am wrighting the right code ?

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public class ApexCallout { // Called Through ProcessBuilder
@InvocableMethod
public static void invokecallout(list<Lead> Leads) {
WS_Webservice.Notification(Leads[0].id, Leads[0].name)
   }
}
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@isTest
private class ApexCalloutTest{
    private static testMethod void doTest() {

        Test.startTest();
        Lead l = new Lead(id = '00XXXXXXXXXXXXXX',
                          name = 'User123');
        Test.stopTest();

    }
}


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Global class WS_Webservice {
  @future (callout=true)
   // Receiving the Lead details from Invokable class ApexCallout.
  WebService static void Notification(id lid, String name)
        { 
        HttpRequest req = new HttpRequest();
        HttpResponse res = new HttpResponse();
        Http http = new Http();

        req.setEndpoint('https://google.com');
        
        //Setting Method Content and Body
        req.setMethod('POST');
        req.setHeader('Content-Type','application/x-www-form-urlencoded');
        req.setBody(
        'name='+EncodingUtil.urlEncode(name, 'UTF-8')
        
      );
        req.setTimeout(120000);
        try {
         res = http.send(req);
         System.debug(res.getbody());
        
         Dom.Document docx = new Dom.Document();
         docx.load(res.getbody());
         dom.XmlNode xroot = docx.getrootelement();
         String U_Id = xroot.getAttributeValue('U_Id', null);
         system.debug(U_Id );
         Lead le = new Lead(id=lid);
         le.ID__c = U_Id;
         update le;
        } 
        catch(System.CalloutException e) {
            System.debug('Callout error: '+ e);
            System.debug(res.toString());
            res.getbody();
               }
            }
       }