/spec/javascripts/compositeView.spec.js

describe("composite view", function(){
  "use strict";

  describe("when a composite view has a template without a model", function(){
    var compositeView;

    var ItemView = Backbone.Marionette.ItemView.extend({
      tagName: "span",
      render: function(){
        this.$el.html(this.model.get("foo"));
      }
    });

    var CompositeViewNoModel = Backbone.Marionette.CompositeView.extend({
      itemView: ItemView,
      template: "#composite-template-no-model"
    });

    beforeEach(function(){
      loadFixtures("compositeTemplate-noModel.html");

      var m1 = new Model({foo: "bar"});
      var m2 = new Model({foo: "baz"});
      var collection = new Collection([m1, m2]);

      compositeView = new CompositeViewNoModel({
        collection: collection
      });

      compositeView.render();
    });

    it("should render the template", function(){
      expect(compositeView.$el).toHaveText(/composite/);
    });

    it("should render the collection's items", function(){
      expect(compositeView.$el).toHaveText(/bar/);
      expect(compositeView.$el).toHaveText(/baz/);
    });
  });

  describe("when a composite view has a model and a template", function(){
    var compositeView;

    var ItemView = Backbone.Marionette.ItemView.extend({
      tagName: "span",
      render: function(){
        this.$el.html(this.model.get("foo"));
      }
    });

    var CompositeView = Backbone.Marionette.CompositeView.extend({
      itemView: ItemView,
      template: "#composite-template",

      onRender: function(){}
    });

    beforeEach(function(){
      loadFixtures("compositeTemplate.html");

      var m1 = new Model({foo: "bar"});
      var m2 = new Model({foo: "baz"});
      var collection = new Collection();
      collection.add(m2);

      compositeView = new CompositeView({
        model: m1,
        collection: collection
      });

      compositeView.render();
    });

    it("should render the template with the model", function(){
      expect(compositeView.$el).toHaveText(/composite bar/);
    });

    it("should render the collection's items", function(){
      expect(compositeView.$el).toHaveText(/baz/);
    });
  });

  describe("when a composite view triggers render in initialize", function(){
    var compositeView;

    var on_show;

    var EmptyView = Backbone.Marionette.ItemView.extend({
      template: "#emptyTemplate",
      tagName: "hr",
      onShow: function() {
          on_show.push("EMPTY");
      }
    });

    var ItemView = Backbone.Marionette.ItemView.extend({
      template: "#collectionItemTemplate",
      tagName: "span"
    });

    var CompositeView = Backbone.Marionette.CompositeView.extend({
      itemView: ItemView,
      emptyView: EmptyView,
      template: "#collection-template",
      initialize: function() {
        this.render();
      },
      onRender: function(){}
    });

    beforeEach(function(){
      loadFixtures("collectionTemplate.html", "collectionItemTemplate.html",
          "emptyTemplate.html");

      var m1 = new Model({foo: "bar"});

      compositeView = new CompositeView({
          model: m1,
          collection: new Collection()
      });

      on_show = [];

      compositeView.trigger("show");
    });

    it("should call 'onShowCallbacks.add'", function(){
        expect(on_show.length == 1).toBeTruthy();
    });
  });

  describe("when rendering a composite view without a template", function(){
    var compositeView, deferredResolved;

    var ItemView = Backbone.Marionette.ItemView.extend({
      tagName: "span",
      render: function(){
        this.$el.html(this.model.get("foo"));
      }
    });

    var CompositeView = Backbone.Marionette.CompositeView.extend({
      itemView: ItemView,
    });

    beforeEach(function(){
      var m1 = new Model({foo: "bar"});
      var m2 = new Model({foo: "baz"});
      var collection = new Collection();
      collection.add(m2);

      compositeView = new CompositeView({
        model: m1,
        collection: collection
      });
    });

    it("should throw an exception because there was no valid template", function(){
      expect(compositeView.render).toThrow(new Error("Cannot render the template since it's false, null or undefined."));
    });
  });
  
  describe("when rendering a composite view", function(){
    var compositeView, order, deferredResolved;

    var ItemView = Backbone.Marionette.ItemView.extend({
      tagName: "span",
      render: function(){
        this.$el.html(this.model.get("foo"));
      }
    });

    var CompositeView = Backbone.Marionette.CompositeView.extend({
      itemView: ItemView,
      template: "#composite-template",

      onRender: function(){}
    });

    beforeEach(function(){
      order = [];
      loadFixtures("compositeTemplate.html");

      var m1 = new Model({foo: "bar"});
      var m2 = new Model({foo: "baz"});
      var collection = new Collection();
      collection.add(m2);

      compositeView = new CompositeView({
        model: m1,
        collection: collection
      });

      compositeView.on("composite:model:rendered", function(){
        order.push(compositeView.renderedModelView);
      });

      compositeView.on("composite:collection:rendered", function(){
        order.push(compositeView.collection);
      });

      compositeView.on("composite:rendered", function(){
        order.push(compositeView);
      });

      spyOn(compositeView, "trigger").andCallThrough();
      spyOn(compositeView, "onRender").andCallThrough();

      compositeView.render();
    });

    it("should trigger a rendered event for the model view", function(){
      expect(compositeView.trigger).toHaveBeenCalledWith("composite:model:rendered");
    });

    it("should trigger a rendered event for the collection", function(){
      expect(compositeView.trigger).toHaveBeenCalledWith("composite:collection:rendered");
    });

    it("should trigger a rendered event for the composite view", function(){
      expect(compositeView.trigger).toHaveBeenCalledWith("composite:rendered");
    });

    it("should guarantee rendering of the model before rendering the collection", function(){
      expect(order[0]).toBe(compositeView.renderedModelView);
      expect(order[1]).toBe(compositeView.collection);
      expect(order[2]).toBe(compositeView);
    });

    it("should call 'onRender'", function(){
      expect(compositeView.onRender).toHaveBeenCalled();
    });

    it("should only call 'onRender' once", function(){
      expect(compositeView.onRender.callCount).toBe(1);
    })
  });

  describe("when rendering a composite view twice", function(){
    var compositeView, compositeRenderSpy;

    var ItemView = Backbone.Marionette.ItemView.extend({
      tagName: "span",
      render: function(){
        this.$el.html(this.model.get("foo"));
      }
    });

    var CompositeModelView = Backbone.Marionette.CompositeView.extend({
      itemView: ItemView,
      template: "#composite-template"
    });

    beforeEach(function(){
      loadFixtures("compositeTemplate.html");

      var m1 = new Model({foo: "bar"});
      var m2 = new Model({foo: "baz"});
      var collection = new Collection();
      collection.add(m2);

      compositeView = new CompositeModelView({
        model: m1,
        collection: collection
      });

      spyOn(compositeView, "render").andCallThrough();
      spyOn(compositeView, "closeChildren").andCallThrough();
      spyOn(Backbone.Marionette.Renderer, "render");
      compositeRenderSpy = compositeView.render;

      compositeView.render();
      compositeView.render();
    });

    it("should re-render the template view", function(){
      expect(Backbone.Marionette.Renderer.render.callCount).toBe(2);
    });

    it("should close all of the child collection item views", function(){
      expect(compositeView.closeChildren).toHaveBeenCalled();
      expect(compositeView.closeChildren.callCount).toBe(2);
    });

    it("should re-render the collection's items", function(){
      expect(compositeRenderSpy.callCount).toBe(2);
    });
  });

  describe("when rendering a composite view with an empty collection and then resetting the collection", function(){
    var compositeView;

    var ItemView = Backbone.Marionette.ItemView.extend({
      tagName: "span",
      render: function(){
        this.$el.html(this.model.get("foo"));
      }
    });

    var CompositeView = Backbone.Marionette.CompositeView.extend({
      itemView: ItemView,
      template: "#composite-template",

      onRender: function(){}
    });

    beforeEach(function(){
      loadFixtures("compositeRerender.html");

      var m1 = new Model({foo: "bar"});
      var collection = new Collection();
      compositeView = new CompositeView({
        model: m1,
        collection: collection
      });

      compositeView.render();

      var m2 = new Model({foo: "baz"});
      collection.reset([m2]);
    });

    it("should render the template with the model", function(){
      expect(compositeView.$el).toHaveText(/composite bar/);
    });

    it("should render the collection's items", function(){
      expect(compositeView.$el).toHaveText(/baz/);
    });
  });

  describe("when rendering a composite view without a collection", function(){
    var compositeView;

    var ItemView = Backbone.Marionette.ItemView.extend({
      tagName: "span",
      render: function(){
        this.$el.html(this.model.get("foo"));
      }
    });

    var CompositeView = Backbone.Marionette.CompositeView.extend({
      itemView: ItemView,
      template: "#composite-template",

      onRender: function(){}
    });

    beforeEach(function(){
      loadFixtures("compositeRerender.html");

      var m1 = new Model({foo: "bar"});
      compositeView = new CompositeView({
        model: m1
      });

      compositeView.render();
    });

    it("should render the template with the model", function(){
      expect(compositeView.$el).toHaveText(/composite bar/);
    });

    it("should not render the collection's items", function(){
      expect(compositeView.$el).not.toHaveText(/baz/);
    });
  });

  describe("when rendering a composite with a collection and then resetting the collection", function(){
    var compositeView;

    var ItemView = Backbone.Marionette.ItemView.extend({
      tagName: "span",
      render: function(){
        this.$el.html(this.model.get("foo"));
      }
    });

    var CompositeView = Backbone.Marionette.CompositeView.extend({
      itemView: ItemView,
      template: "#composite-template",

      onRender: function(){}
    });

    beforeEach(function(){
      loadFixtures("compositeRerender.html");

      var m1 = new Model({foo: "bar"});
      var m2 = new Model({foo: "baz"});
      var collection = new Collection([m2]);

      compositeView = new CompositeView({
        model: m1,
        collection: collection
      });

      compositeView.render();

      spyOn(compositeView, "renderModel").andCallThrough();

      var m3 = new Model({foo: "quux"});
      var m4 = new Model({foo: "widget"});
      collection.reset([m3, m4]);
    });

    it("should not re-render the template with the model", function(){
      expect(compositeView.renderModel).not.toHaveBeenCalled();
    });

    it("should render the collection's items", function(){
      expect(compositeView.$el).not.toHaveText(/baz/);
      expect(compositeView.$el).toHaveText(/quux/);
      expect(compositeView.$el).toHaveText(/widget/);
    });
  });

  describe("when workign with a composite and recursive model", function(){
    var treeView;

    beforeEach(function(){
      loadFixtures("recursiveCompositeTemplate.html");

      var data = {
        name: "level 1",
        nodes: [
          {
            name: "level 2",
            nodes: [
              {
                name: "level 3"
              }
            ]
          }
        ]
      };

      var node = new Node(data);
      treeView = new TreeView({
        model: node
      });

      treeView.render();
    });

    it("should render the template with the model", function(){
      expect(treeView.$el).toHaveText(/level 1/);
    });

    it("should render the collection's items", function(){
      expect(treeView.$el).toHaveText(/level 2/);
    });

    it("should render all the levels of the nested object", function(){
      expect(treeView.$el).toHaveText(/level 3/);
    });
  });

  describe("when closing a composite view", function(){
    var compositeView, compositeModelCloseSpy;

    var ItemView = Backbone.Marionette.ItemView.extend({
      tagName: "span",
      render: function(){
        this.$el.html(this.model.get("foo"));
      }
    });

    var CompositeModelView = Backbone.Marionette.CompositeView.extend({
      itemView: ItemView,
      template: "#composite-template"
    });

    beforeEach(function(){
      loadFixtures("compositeTemplate.html");

      var m1 = new Model({foo: "bar"});
      var m2 = new Model({foo: "baz"});
      var collection = new Collection();
      collection.add(m2);

      compositeView = new CompositeModelView({
        model: m1,
        collection: collection
      });

      spyOn(CompositeModelView.prototype, "close").andCallThrough();

      compositeView.render();

      compositeView.close();
    });

    it("should delete the model view", function(){
      expect(compositeView.renderedModelView).toBeUndefined();
    });

    it("should close the collection of views", function(){
      expect(CompositeModelView.prototype.close.callCount).toBe(1);
    });
  });

  describe("when rendering a composite view with no model, using a template to create a grid", function(){

    var gridView;

    // A Grid Row
    var GridRow = Backbone.Marionette.ItemView.extend({
      tagName: "tr",
      template: "#row-template"
    });

    // The grid view
    var GridView = Backbone.Marionette.CompositeView.extend({
      tagName: "table",
      template: "#grid-template",
      itemView: GridRow,

      appendHtml: function(cv, iv){
        cv.$("tbody").append(iv.el);
      }
    });

    beforeEach(function(){
      loadFixtures("gridTemplates.html");

      var userData = [
        {
          username: "dbailey",
          fullname: "Derick Bailey"
        },
        {
          username: "jbob",
        fullname: "Joe Bob"
        },
        {
          username: "fbar",
        fullname: "Foo Bar"
        }
      ];

      var userList = new UserCollection(userData);

      gridView = new GridView({
        tagName: "table",
        collection: userList
      });

      gridView.render();
    });

    it("should render the table", function(){
      expect(gridView.$("th").length).not.toBe(0);
    });

    it("should render the users", function(){
      var body = gridView.$("tbody");
      expect(body).toHaveText(/dbailey/);
      expect(body).toHaveText(/jbob/);
      expect(body).toHaveText(/fbar/);
    });
  });

  describe("when a composite view has a ui elements hash", function() {

    var called, gridView, headersModel;

    // A Grid Row
    var GridRow = Backbone.Marionette.ItemView.extend({
      tagName: "tr",
      template: "#row-template"
    });

    // The grid view
    var GridView = Backbone.Marionette.CompositeView.extend({
      tagName: "table",
      template: "#grid-template",
      itemView: GridRow,

      appendHtml: function(cv, iv){
        cv.$("tbody").append(iv.el);
      }
    });

    var GridViewWithUIBindings = GridView.extend({
      template: "#ui-binding-template",

      ui: {
        headersRow: "thead tr",
        unfoundElement: "#unfound",
        itemRows: "tbody tr"
      }
    });

    beforeEach(function() {
      loadFixtures("uiBindingTemplate.html");

      var userData = [
        {
          username: "dbailey",
          fullname: "Derick Bailey"
        },
        {
          username: "jbob",
          fullname: "Joe Bob"
        }
      ];

      headersModel = new Backbone.Model({
        userHeader: "Username",
        nameHeader: "Full name"
      });

      var userList = new UserCollection(userData);

      gridView = new GridViewWithUIBindings({
        tagName: "table",
        model: headersModel,
        collection: userList
      });

      // We don't render the view here since we need more fine-tuned control on when the view is rendered,
      // specifically in the test that asserts the composite view template elements are accessible before
      // the collection is rendered.
    });

    describe("after the whole composite view finished rendering", function() {

      beforeEach(function() {
        gridView.render();
      });

      describe("accessing a ui element that belongs to the model template", function() {

        it("should return its jQuery selector if it can be found", function() {
          expect(gridView.ui.headersRow.find("th:first-child")).toHaveText("Username");
        });

        it("should return an empty jQuery object if it cannot be found", function() {
          expect(gridView.ui.unfoundElement.length).toEqual(0);
        });

        it("should return an up-to-date selector on subsequent renders", function() {
          // asserting state before subsequent render
          expect(gridView.ui.headersRow.find("th:first-child")).toHaveText("Username");

          headersModel.set("userHeader", "User");
          gridView.render();

          expect(gridView.ui.headersRow.find("th:first-child")).toHaveText("User");
        });

      });

      describe("accessing a ui element that belongs to the collection", function() {

        // This test makes it clear that not allowing access to the collection elements is a design decision
        // and not a bug.
        it("should return an empty jQuery object", function() {
          expect(gridView.ui.itemRows.length).toEqual(0);
        });

      });

    });

    describe("after the model finished rendering, but before the collection rendered", function() {

      describe("accessing a ui element that belongs to the model template", function() {

        beforeEach(function(){

          gridView.onBeforeRender = function() {
            called = true;
          };
          spyOn(gridView, "onBeforeRender").andCallThrough();

          gridView.render();

        });

        // this test enforces that ui elements should be accessible as soon as their html was inserted
        // to the DOM
        it("should return its jQuery selector", function() {
          expect(gridView.onBeforeRender).toHaveBeenCalled();
        })

        it("should set the username", function(){
          expect($(gridView.ui.headersRow).find("th:first-child").text()).toEqual("Username");
        });

      });

    });

  });
  
  describe("has a valid inheritance chain back to Marionette.CollectionView", function(){
    
    var constructor;
    
    beforeEach(function(){
      constructor = spyOn(Marionette.CollectionView.prototype, "constructor");
      new Marionette.CompositeView();
    });
    
    it("calls the parent Marionette.CollectionView's constructor function on instantiation", function(){
      expect(constructor).toHaveBeenCalled();
    });
  });

  // Models

  var Model = Backbone.Model.extend({});

  var User = Backbone.Model.extend({});

  var Node = Backbone.Model.extend({
    initialize: function(){
      var nodes = this.get("nodes");
      if (nodes){
        this.nodes = new NodeCollection(nodes);
        this.unset("nodes");
      }
    }
  });

  // Collections

  var Collection = Backbone.Collection.extend({
    model: Model
  });

  var UserCollection = Backbone.Collection.extend({
    model: User
  });

  var NodeCollection = Backbone.Collection.extend({
    model: Node
  });

  // Views

  var TreeView = Backbone.Marionette.CompositeView.extend({
    tagName: "ul",
    template: "#recursive-composite-template",

    initialize: function(){
      this.collection = this.model.nodes;
    }
  });

});