public void EndSession_WithoutSubsidizedPrice_Ok()
        {
            _tutorMoq.Setup(s => s.Price).Returns(new TutorPrice(10, 5));
            var studyRoomSession = new StudyRoomSession(_studyRoom.Object, "testId");
            var prop             = studyRoomSession.GetType().GetProperty("Created");

            prop.SetValue(studyRoomSession, DateTime.UtcNow.AddHours(-1));
            studyRoomSession.EndSession();
            studyRoomSession.Price.Should().NotBeNull();
            studyRoomSession.Price.Should().Be(5M);
        }