public async Task CreateNew_InsertOneLecture_ReturnLectureId()
        {
            //Arrange

            var teacherService = new TeacherService(context, context);
            var teachers       = await teacherService.GetAll();

            var teacherId = teachers[teachers.Count - 1].Id;

            var subjectService = new SubjectService(context, context);
            var subjects       = await subjectService.GetAllSubjects();

            var subjectId = subjects[subjects.Count - 1].Id;

            LectureCreateModel model = new LectureCreateModel()
            {
                Name      = "Course .NET",
                Weekday   = "Wednesday",
                StartHour = 8,
                EndHour   = 10,
                HalfYear  = "A"
            };

            //Act
            var result = await lectureService.CreateNew(teacherId, subjectId, model);

            //Assert
            Assert.IsInstanceOfType(result, typeof(System.Guid));
        }