public void SetUp() { // Boilerplate _fixture = new Fixture(); //Prevent fixture from generating from entity circular references _fixture.Behaviors.Add(new OmitOnRecursionBehavior(1)); // Mock setup _context = new PatientBookingContext(new DbContextOptionsBuilder <PatientBookingContext>().UseInMemoryDatabase(Guid.NewGuid().ToString()).Options); // Sut instantiation _addBookingRequestValidator = new AddBookingRequestValidator(_context); }