Test class for REST api to insert multiple records

Question

I have an apex class(REST endpoint) for inserting multiple records into a salesforce object

@RestResource(urlMapping='/MultiTicket/*')
global with sharing class MultiTicketRestController{
   global class RequestBody {
       global List<Ticket__c> tickets;
   }

    @HttpPost   
    global static List<Ticket__c> createBulk(MultiTicketRestController.RequestBody req) {

    for (Ticket__c ticket : req.tickets) {
      List<Activity__c> activity;
      List<Contact> contact;
      List<Payment__c> payment;
      List<User> user;
      List<User> guide;
      List<PriceType__c> priceType;  
    String activity_ID=ticket.Activity__c;
    activity=[SELECT id from Activity__c where ExternalAID__c=:Integer.valueOf(activity_ID)];
    ticket.Activity__c=activity.get(0).ID;
    String payment_ID=ticket.Payment__c;
    if(!String.isEmpty(payment_ID)) 
    {payment=[SELECT id from Payment__c where External_Pay__c=:Integer.valueOf(payment_ID)];
    ticket.Payment__c=payment.get(0).ID;}
    else{ticket.Payment__c=null;}
    String contact_ID=ticket.Contact__c;
    contact=[SELECT id from  Contact where ExternalCID__c=:Integer.valueOf(contact_ID)];
    ticket.Contact__c=contact.get(0).ID;
    String pricetype_ID=ticket.PriceType__c;
    priceType=[SELECT id from PriceType__c where External_PriceType_ID__c=:Integer.valueOf(pricetype_ID)];
    ticket.PriceType__c=priceType.get(0).ID;
    String user_ID=ticket.User__c;
    if(!String.isEmpty(user_ID))
     {user=[SELECT id from User where External_UserID__c=:Integer.valueOf(user_ID)];
      ticket.User__c=user.get(0).ID;}
    else{ticket.User__c=null;}
    String guide_ID=ticket.Guide__c;
    if(!String.isEmpty(guide_ID)) 
    {guide=[SELECT id from User where External_UserID__c=:Integer.valueOf(guide_ID)];
     ticket.Guide__c=guide.get(0).ID;}
    else{ticket.Guide__c=null;}
    System.Debug(String.valueOf(activity_ID));



     }
        insert req.tickets; 
        return req.tickets;
    }

}

I was trying to write a test class for this. My request is in the form of an XML or a JSON. So I am not able create ticket objects to test my class because the controller parses the raw json/xml input and puts it into ticket objects. How can I pass in a request to test this class. I am stuck!!

Sample request for endpoint:

{"req" : {"tickets": [
{
"External_TicketID__c" :"666",
"Date_Time__c: "2015-09-13T22:30:00.000Z",
"Payment__c":,
"Contact__c" :"3",
"Activity__c" :333,
"PriceType__c": 3,
"User__c":3,
"Guide__c":4,
"Price__c" :"12.50",
"Fees__c" :340,
"Status__c": "sale",
"Quantity__c": "2",
"Last_Transaction_No__c":123
},
{
"External_TicketID__c" :"777",
"Date_Time__c: "2015-09-13T22:30:00.000Z",
"Payment__c":,
"Contact__c" :"3",
"Activity__c" :333,
"PriceType__c": 3,
"User__c":3,
"Guide__c":,
"Price__c" :"12.50",
"Fees__c" :340,
"Status__c": "sale",
"Quantity__c": "2",
"Last_Transaction_No__c":123
}
]}}

Answer 1

Note that you can just call the @HttpPostmethod with the appropriate object structure (with the objects new'ed in the test class) as the aim is to test your code not the platform's JSON parsing code.

But if you really want to start from JSON for some reason (say stored in static resources or hard coded as Apex strings in your test class), use JSON.deserialize to turn the JSON into objects and then call the @HttpPost method in your test code:

MultiTicketRestController.RequestBody req = (MultiTicketRestController.RequestBody) JSON.deserialize(jsonString, MultiTicketRestController.RequestBody.class);
List<Ticket__c> tickets = MultiTicketRestController.createBulk(req);