(function () {
'use strict';

var ID = 'ext/title';
var DEPS = ['_', 'core/event', 'core/settings'];

describe('module \'' + ID + '\'', function () {

    before(function () {

        this.definition = modulejs._private.definitions[ID];

        this.xEvent = {
            sub: sinon.stub()
        };
        this.xSettings = {title: {
            enabled: true
        }};

        this.applyFn = function () {

            this.xEvent.sub.reset();

            return this.definition.fn(_, this.xEvent, this.xSettings);
        };
    });

    after(function () {

        util.restoreHtml();
    });

    describe('definition', function () {

        it('is defined', function () {

            assert.isPlainObject(this.definition);
        });

        it('has correct id', function () {

            assert.strictEqual(this.definition.id, ID);
        });

        it('requires correct', function () {

            assert.deepEqual(this.definition.deps, DEPS);
        });

        it('args for each request', function () {

            assert.strictEqual(this.definition.deps.length, this.definition.fn.length);
        });

        it('has no instance', function () {

            assert.notProperty(modulejs._private.instances, ID);
        });

        it('inits without errors', function () {

            this.applyFn();
        });
    });

    describe('application', function () {

        it('returns undefined', function () {

            var instance = this.applyFn();
            assert.isUndefined(instance);
        });

        it('subscribes to location.changed', function () {

            this.xSettings.title.enabled = true;

            this.applyFn();
            assert.isTrue(this.xEvent.sub.calledOnce);
            assert.strictEqual(this.xEvent.sub.lastCall.args[0], 'location.changed');
        });

        it('does not subscribe to events if disabled', function () {

            this.xSettings.title.enabled = false;

            this.applyFn();
            assert.isFalse(this.xEvent.sub.called);
        });
    });

    describe('sets title on location.changed', function () {

        _.each([
            [''],
            ['a', 'a'],
            ['a', 'b', 'b - a > b'],
            ['a', 'b', 'c', 'c - a > b > c']
        ], function (data) {

            var labels = data.slice(0, -1);
            var exp = data.slice(-1)[0];

            it(labels + ' => ' + exp, function () {

                this.xSettings.title.enabled = true;

                this.applyFn();

                var fn = this.xEvent.sub.lastCall.args[1];
                var crumb = _.map(labels, function (x) { return {label: x}; });
                var item = {
                    getCrumb: sinon.stub().returns(crumb)
                };

                fn(item);

                assert.isTrue(item.getCrumb.calledOnce);
                assert.strictEqual(document.title, exp);
            });
        });
    });
});

}());