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I need help with testing an async callout

I am not sure how to test an async callout and have not had any luck looking at other posts. I am new to apex so i would appreciate any help, my class is below split into 2 methods due to a conflicting trigger. I need the future due to the 10 second cpu limitation and i need to update 2.5k rows of data based on the json it works when i run it pn my test site but i cant get the test coverage.

public class JSONPullData {
   public static List<Contract> con2;
    public static HttpResponse response;
    
    // @future(callout=true)
    public static HttpResponse parseJSONResponse() {        

            update con2;
        
        return response;
    }
        
        
     
    @future(callout=true)
    public static void processData(){
                //Setup the connection to the json to pull in
        JsonUtil Jutil = new JsonUtil();
         Http httpProtocol = new Http();
        // Create HTTP request to send.
        HttpRequest request = new HttpRequest();
        // Set the endpoint URL.
        request.setEndPoint('https://api.myjson.com/bins/hs68h');
        // Set the HTTP verb to GET.
        request.setMethod('GET');
        // Send the HTTP request and get the response.
        // The response is in JSON format.
       response = httpProtocol.send(request);
       
        if(response.getStatusCode() == 200){
            //System.debug(response.getBody());
            
            //deserialize the json 
            List<Object> eqt = (List<Object>) JSON.deserializeUntyped(response.getBody());
            //add the street address to the set the set cannot have duplicates so the street must be unique
            Map<string,string> st = new Map<string,string>();
            Map<string,Double> stRent = new Map<string,Double>();
            for (Object o : eqt){
                Map<String,Object> mapobj = (Map<string,Object>)o;
                
                st.put((String)mapobj.get('Street'),(String)mapobj.get('Date'));
                stRent.put((String)mapobj.get('Street'),(Double)mapobj.get('Rent'));
                
            }
            //find all the space names that match the street in the set
            // System.debug(st);
            Map<ID,Contract> con = new Map<ID,Contract>([Select id, Space__r.Name,Current_Rental_Rate__c, Space__c from Contract where Space__r.Name IN :st.keySet() and Active__c = TRUE]);
            
            //create a list of spaces that are connected to the leases
            List<Space__c> s = [Select id,Name,Active_Contract__c from Space__c where Active_Contract__c IN :con.keySet()];
            //System.debug(s);
            //create maps to locate the data
            Map<id, Double> holdLease = new  Map<id, Double>();
            Map<id, Date> holdDate = new  Map<id, Date>();
            for(Space__c c: s){
                //for (Object o : eqt){
                // Map<string,Object> mapobj = (Map<string,Object>)o;
                //  if(c.Name == (String)mapobj.get('Street')){
                //    System.debug((String)mapobj.get('Renewal Date'));
                //map the rent and renewal date
                System.debug(c.Name);
 
                Date d = date.parse(st.get(c.Name));
                
               
                holdDate.put(c.Active_Contract__c, d);
                holdLease.put(c.Active_Contract__c, stRent.get(c.Name));
                
                
            }
            
            //}    
            
            con2 = [Select id, Space__r.Name,Name,Current_Rental_Rate__c, Space__c from Contract where id in :holdLease.keySet()];
            // System.debug(con2);
            // 
            //set up email
            Messaging.SingleEmailMessage message = new Messaging.SingleEmailMessage();
            message.setSenderDisplayName('Salesforce Support');
            message.toAddresses = new String[] { 'email@email.com' };
                message.optOutPolicy = 'FILTER';
            message.subject = 'Log Updated Rent for lease rr';
            String mess = '';
            mess = mess + 'Lease ID - Lease Name - Space Name - Rent' + '</br></br>';
            for(Contract c: con2){
                if(holdLease.containsKey(c.id)){
                    //modify the values
                    mess = mess + c.id + ' - ' + c.Name + ' - ' + c.Space__r.Name + ' - ' + c.Current_Rental_Rate__c  + '</br>';
                    c.Current_Rental_Rate__c = holdLease.get(c.id);
                    c.Renewal_Date__c = holdDate.get(c.id);
                }
                
                
            }
            
            message.setHtmlBody(mess);
            Messaging.SingleEmailMessage[] messages =  new List<Messaging.SingleEmailMessage> {message};
                Messaging.SendEmailResult[] results = Messaging.sendEmail(messages);
            JSONPullData.parseJSONResponse();
    }
    
}
}


@isTest
private class JsonPullDataCallout_Test {
    @isTest static void testCallout() {
        // Set mock callout class 
        Test.setMock(HttpCalloutMock.class, new JsonPullData_Test());
        
        // Call method to test.
        // This causes a fake response to be sent
        // from the class that implements HttpCalloutMock.
        Test.startTest(); 
        JSONPullData.processData();
        Test.stopTest();
        HttpResponse res = JSONPullData.response;
        // Verify response received contains fake values
        String contentType = res.getHeader('Content-Type');
        System.assert(contentType == 'application/json');
        String actualValue = res.getBody();
        String expectedValue = '[{"Street":"123 Test Road","Rent":1356.95,"Date":"1/9/2017"}]';
        System.assertEquals(actualValue, expectedValue);
        System.assertEquals(200, res.getStatusCode());
        
        
    }
}

@isTest
global class JsonPullData_Test implements HttpCalloutMock {
    // Implement this interface method
    public static HTTPResponse res;
    global HTTPResponse respond(HTTPRequest req) {
        // Optionally, only send a mock response for a specific endpoint
        // and method.
        System.assertEquals('https://api.myjson.com/bins/hs68h', req.getEndpoint());
        System.assertEquals('GET', req.getMethod());
        


        
        //System.assertEquals(1356.95, con2[0].Current_Rental_Rate__c);
        //System.assertEquals(date.parse('1/9/2017'), con2[0].Renewal_Date__c);
        
        return res;
    }

    }
@isTest
global class JsonPullData_Test implements HttpCalloutMock {
    // Implement this interface method
    public static HTTPResponse res;
    global HTTPResponse respond(HTTPRequest req) {
        // Optionally, only send a mock response for a specific endpoint
        // and method.
        System.assertEquals('https://api.myjson.com/bins/hs68h', req.getEndpoint());
      
        System.assertEquals('GET', req.getMethod());
        
        // Create a fake response
        HttpResponse res = new HttpResponse();
        res.setHeader('Content-Type', 'application/json');
        res.setBody('[{"Street":"123 Test Road","Rent":1356.95,"Date":"1/9/2017"}]');
        res.setStatusCode(200);
        return res;
    }

    }