public void MapsRepository_Delete_1_element_result_is_deleted()
        {
            // Arrange.
            MapsRepository mapsRepository = new MapsRepository(_mockContext.Object);

            // Act.
            mapsRepository.Delete(1);

            // Assert.
            Assert.AreEqual(0, _mockContext.Object.Maps.Where(el =>
                                                              el.Name == "Name1" &&
                                                              el.Latitude == "56.278206" &&
                                                              el.Longitude == "43.971291" &&
                                                              el.Length == 100 &&
                                                              el.Width == 100 &&
                                                              el.Scale == 10000).ToList().Count);
        }