public void CheckAssignmentExistAfterDelete()
        {
            //Arrange
            Assignment assignment1 = new Assignment()
            {
                Id          = 66,
                Name        = "test",
                Description = "unit"
            };
            Assignment assignment2 = new Assignment()
            {
                Id          = 77,
                Name        = "test",
                Description = "unit"
            };

            var options = new DbContextOptionsBuilder <Context>()
                          .UseInMemoryDatabase(databaseName: "UsersDirectoryMVC")
                          .Options;

            using (var context = new Context(options))
            {
                //Act
                var assignmentRepository = new AssignmentRepository(context);
                assignmentRepository.AddAssignment(assignment1);
                assignmentRepository.AddAssignment(assignment2);
                assignmentRepository.DeleteAssignment(66);
                var gerAssignment1 = assignmentRepository.GetAssignment(66);
                var gerAssignment2 = assignmentRepository.GetAssignment(77);
                //Assert
                gerAssignment1.Should().BeNull();
                gerAssignment2.Should().Equals(assignment2);
            }
        }