import addChangeUrlEvent from "./change-url-event";

 
 it("it should add changeUrlEventCreator to popstate,pushstate,replacestate", () => {
   // given
   const window = {};
   const map = {};
 
   window.addEventListener = jest.fn((event, cb) => {
     map[event] = cb;
   });
 
   // when
   addChangeUrlEvent(window);
 
   // then

   expect(map["popstate"]).toBeDefined();
   expect(map["pushstate"]).toBeDefined();
   expect(map["replacestate"]).toBeDefined();

 });
 
 it("given event handler should generate a urlchange event only when url changes", () => {
   // given
   const window = {
     location: {

       hash: "#hash",
       host: "example.com",
       hostname: "example",
       origin: "",
       href: "",
       pathname: "/path/to/thing",

       port: 80,

       protocol: "https:"

     }
   };
   const map = {};
   const calls = [];
 
   window.addEventListener = jest.fn((event, cb) => {
     map[event] = cb;
   });
 
   window.dispatchEvent = jest.fn(ev => {
     const evName = ev.type;
     calls.push(ev);

     if (map[evName]) {

       map[evName].handleEvent(ev);
     }
   });
 
   // when
   addChangeUrlEvent(window);

   window.dispatchEvent(new Event("popstate"));
   window.dispatchEvent(new Event("popstate"));

 
   // then
   expect(calls.length).toEqual(3);

   expect(calls[1].type).toEqual("urlchanged");

   expect(calls[1].detail).toEqual(window.location);
 
   //when

   window.location.pathname = "/new/path";
   window.dispatchEvent(new Event("popstate"));

 
   //then
   expect(calls.length).toEqual(5);

   expect(calls[4].type).toEqual("urlchanged");

   expect(calls[4].detail).toEqual(window.location);
 });
 
 it("should only add url events 1x when addChangeUrlEvent is called on window more than 1x", () => {

   // given

   const window = {};

   const map = {};
 
   window.addEventListener = jest.fn((event, cb) => {

     if (!map[event]) {

       map[event] = [];
     }
     map[event].push(cb);
   });
 
   // when
   addChangeUrlEvent(window);
   addChangeUrlEvent(window);
   addChangeUrlEvent(window);
 
   expect(Object.keys(map).length).toEqual(3);
   //then
   for (let event of Object.keys(map)) {
     expect(map[event].length).toEqual(1);
   }

 });