public async Task AdvancedSearchingTest1()
        {
            SetMockContext("jablonskim");
            AdvancedSearchingModel model = new AdvancedSearchingModel()
            {
                Username     = "******",
                MinimalDate  = new DateTime(2015, 12, 20),
                MinimalPrice = "300",
                PlaceName    = "Pensjonat pod różą"
            };

            var result = await _controller.Advanced(model);

            Assert.IsNotNull(result);
            Assert.AreEqual(2, model.Offers.Count());
        }