public void MapsRepository_Create_1_element_result_is_added()
        {
            // Arrange.
            MapsRepository mapsRepository = new MapsRepository(_mockContext.Object);
            Map            addMap         = new Map
            {
                Name      = "added name",
                Length    = 120,
                Latitude  = "56.278206",
                Longitude = "43.971291",
                Width     = 120,
                Scale     = 1200
            };

            // Act.
            mapsRepository.Create(addMap);

            // Assert.
            Assert.AreEqual(1, _mockContext.Object.Maps.Where(el =>
                                                              el.Name == "added name" &&
                                                              el.Latitude == "56.278206" &&
                                                              el.Longitude == "43.971291" &&
                                                              el.Length == 120 &&
                                                              el.Width == 120 &&
                                                              el.Scale == 1200).ToList().Count);
        }