(function () {
'use strict';

describe('premisses', function () {

    it('window is global object', function () {

        assert.isObject(window);
        assert.strictEqual(window, window.window);
    });

    it('document is global object', function () {

        assert.isObject(document);
        assert.strictEqual(document, window.document);
    });

    it('jQuery and $ are global functions', function () {

        assert.isFunction(jQuery);
        assert.strictEqual(jQuery, window.jQuery);
        assert.strictEqual(jQuery.fn.jquery, '2.1.3');

        assert.strictEqual($, jQuery);
        assert.strictEqual($, window.$);
    });

    it('_ is global function', function () {

        assert.isFunction(_);
        assert.strictEqual(_, window._);
        assert.strictEqual(_.VERSION, '3.9.3');
    });

    it('util is global object', function () {

        assert.isPlainObject(util);
        assert.strictEqual(util, window.util);
    });

    it('uniq is global object', function () {

        assert.isPlainObject(uniq);
        assert.strictEqual(uniq, window.uniq);
    });

    it('assert.isPlainObject() works', function () {

        assert.isFunction(assert.isPlainObject);

        assert.isPlainObject({});
        assert.isPlainObject({a: 1});
        assert.isPlainObject(Object());
        assert.isPlainObject(new Object());

        assert.throws(function () { assert.isPlainObject(); });
        assert.throws(function () { assert.isPlainObject(1); });
        assert.throws(function () { assert.isPlainObject('a'); });
        assert.throws(function () { assert.isPlainObject(new Date()); });
        assert.throws(function () { assert.isPlainObject(/a/); });
        assert.throws(function () { assert.isPlainObject(function () {}); });
        assert.throws(function () { assert.isPlainObject(new function A() {}); });
    });

    it('assert.lengthOfKeys() works', function () {

        assert.isFunction(assert.lengthOfKeys);

        assert.lengthOfKeys({}, 0);
        assert.lengthOfKeys({a: true}, 1);
        assert.lengthOfKeys({a: true, b: 0, c: undefined}, 3);

        assert.throws(function () { assert.lengthOfKeys(); });
        assert.throws(function () { assert.lengthOfKeys(1); });
        assert.throws(function () { assert.lengthOfKeys('a'); });
        assert.throws(function () { assert.lengthOfKeys({}); });
        assert.throws(function () { assert.lengthOfKeys({}, 1); });
    });
});

}());