public void GetSessionBy_SessionExists_ReturnsSession()
        {
            Session session = new Session {
                Id = 1
            };
            SessionCalendar sessionCalendar = new SessionCalendar()
            {
                Sessions = new[] { session }
            };

            Assert.Equal(session, sessionCalendar.GetSessionBy(1));
        }
        public void GetSessionBy_SessionDoesNotExist_ReturnsNull()
        {
            SessionCalendar sessionCalendar = new SessionCalendar();

            Assert.Equal(null, sessionCalendar.GetSessionBy(1));
        }