backbone/test/collection.js

$(document).ready(function() {

  module("Backbone.Collection");

  window.lastRequest = null;

  Backbone.sync = function() {
    lastRequest = _.toArray(arguments);
  };

  var a = new Backbone.Model({id: 4, label: 'a'});
  var b = new Backbone.Model({id: 3, label: 'b'});
  var c = new Backbone.Model({id: 2, label: 'c'});
  var d = new Backbone.Model({id: 1, label: 'd'});
  var e = null;
  var col = window.col = new Backbone.Collection([a,b,c,d]);

  test("Collection: new and sort", function() {
    equals(col.first(), a, "a should be first");
    equals(col.last(), d, "d should be last");
    col.comparator = function(model) { return model.id; };
    col.sort();
    equals(col.first(), d, "d should be first");
    equals(col.last(), a, "a should be last");
    equals(col.length, 4);
  });

  test("Collection: get, getByCid", function() {
    equals(col.get(1), d);
    equals(col.get(3), b);
    equals(col.getByCid(col.first().cid), col.first());
  });

  test("Collection: update index when id changes", function() {
    var col = new Backbone.Collection();
    col.add([
      {id : 1, name : 'one'},
      {id : 2, name : 'two'}
    ]);
    var one = col.get(1);
    equals(one.get('name'), 'one');
    one.set({id : 101});
    equals(col.get(1), null);
    equals(col.get(101).get('name'), 'one');
  });

  test("Collection: at", function() {
    equals(col.at(2), b);
  });

  test("Collection: pluck", function() {
    equals(col.pluck('label').join(' '), 'd c b a');
  });

  test("Collection: add", function() {
    var added = null;
    col.bind('add', function(model){ added = model.get('label'); });
    e = new Backbone.Model({id: 0, label : 'e'});
    col.add(e);
    equals(added, 'e');
    equals(col.length, 5);
    equals(col.first(), e);
  });

  test("Collection: remove", function() {
    var removed = null;
    col.bind('remove', function(model){ removed = model.get('label'); });
    col.remove(e);
    equals(removed, 'e');
    equals(col.length, 4);
    equals(col.first(), d);
  });

  test("Collection: fetch", function() {
    col.fetch();
    equals(lastRequest[0], 'read');
    equals(lastRequest[1], col);
  });

  test("Collection: create", function() {
    var model = col.create({label: 'f'});
    equals(lastRequest[0], 'create');
    equals(lastRequest[1], model);
    equals(model.get('label'), 'f');
    equals(model.collection, col);
  });

  test("collection: initialize", function() {
    var Collection = Backbone.Collection.extend({
      initialize: function() {
        this.one = 1;
      }
    });
    var coll = new Collection;
    equals(coll.one, 1);
  });

  test("Collection: toJSON", function() {
    equals(JSON.stringify(col), '[{"id":1,"label":"d"},{"id":2,"label":"c"},{"id":3,"label":"b"},{"id":4,"label":"a"}]');
  });

  test("Collection: Underscore methods", function() {
    equals(col.map(function(model){ return model.get('label'); }).join(' '), 'd c b a');
    equals(col.any(function(model){ return model.id === 100; }), false);
    equals(col.any(function(model){ return model.id === 1; }), true);
    equals(col.indexOf(b), 2);
    equals(col.size(), 4);
    equals(col.rest().length, 3);
    ok(!_.include(col.rest()), a);
    ok(!_.include(col.rest()), d);
    ok(!col.isEmpty());
    ok(!_.include(col.without(d)), d);
    equals(col.max(function(model){ return model.id; }).id, 4);
    equals(col.min(function(model){ return model.id; }).id, 1);
    same(col.chain()
            .filter(function(o){ return o.id % 2 === 0; })
            .map(function(o){ return o.id * 2; })
            .value(),
         [4, 8]);
  });

  test("Collection: refresh", function() {
    var refreshed = 0;
    var models = col.models;
    col.bind('refresh', function() { refreshed += 1; });
    col.refresh([]);
    equals(refreshed, 1);
    equals(col.length, 0);
    equals(col.last(), null);
    col.refresh(models);
    equals(refreshed, 2);
    equals(col.length, 4);
    equals(col.last(), a);
    col.refresh(_.map(models, function(m){ return m.attributes; }));
    equals(refreshed, 3);
    equals(col.length, 4);
    ok(col.last() !== a);
    ok(_.isEqual(col.last().attributes, a.attributes));
  });

});