sample gist of OHHTTPStubs + API end points + local json files in bundle

HTTPStub.swift

import Foundation
import UIKit
import OHHTTPStubs
import SwiftyJSON

@objc class HTTPStub: NSObject {
    

    static let enableHttpStubbing = HTTPStub()
    
    override init() {
        HTTPStub.stubHTTP() // N.B. when enabling do a clean
    }

    class func stubHTTP() {
        
        OHHTTPStubs.setEnabled(true)
        OHHTTPStubs.onStubActivation { (request: URLRequest, stub: OHHTTPStubsDescriptor, response: OHHTTPStubsResponse) in
            if let url = request.url{
                print("[OHHTTPStubs] Request to \(url) has been stubbed stub:",stub.name )
            }
        }
        
        OHHTTPStubs.removeAllStubs()

       
        stubLocalJsonForUrls()

        
    }
    
    class func stubLocalJsonForUrls(){
        
        // HARDCODED URLS + CORRESPONDING JSON FILES
        
        
        let stubbedURLS:[[String : String]]  = [
            
           ["absoluteUrl":"http://www.example.com/get_cars?parameters=1","resource":"cars.json"],
            ["absoluteUrl":"http://www.example.com/get_cars?parameters=2","resource":"cars1.json"],
        ]
        
        
        for d0 in stubbedURLS {
            
            if var fileName = d0["resource"] {
                if let uri = d0["absoluteUrl"] {
                    if fileName.contains("json") {
                        fileName = fileName.components(separatedBy: ".")[0]
                    }
                    let channelsPath = Bundle.main.path(forResource:fileName,ofType:"json")
                    let jsonURL = URL.init(fileURLWithPath: channelsPath!)

                    do{
                        let data = try Data.init(contentsOf: jsonURL, options: Data.ReadingOptions.uncached)
                        let json = JSON(data: data)
                        
                        let responseData = try json.rawData()
                        
                        OHHTTPStubs.stubRequests(passingTest: { (request) -> Bool in
                            
                            if let absoluteURL = request.url?.absoluteString{
                                return( absoluteURL == uri )
                            }
                            
                            return false
                            
                        }) { (request) -> OHHTTPStubsResponse in
                            if let url = request.url?.absoluteString{
                                print("mocking local json:",url)
                            }
                            
                            return OHHTTPStubsResponse(data:responseData , statusCode: 200, headers: ["Content-Type" : "application/json"])
                            }.name = "Local Stubbed URLS"
                        
                        
                    }catch  let jsonerror as NSError {
                        print("exception",jsonerror)
                    }
                }
                
            }
            
            
        }
    }
    
    
    
}