public async Task testChangeStarFail() { var options = new DbContextOptionsBuilder <ApplicationDbContext>() .UseInMemoryDatabase(databaseName: "testChangeStarFail") .Options; using (var context = new ApplicationDbContext(options)) { context.Projects.Add(proj1); context.Projects.Add(proj2); context.Projects.Add(proj3); context.SaveChanges(); }; using (var context = new ApplicationDbContext(options)) { var service = new ListController(context); var result = await service.ChangeStar(vievProjNull); Assert.IsInstanceOfType(result, typeof(BadRequestObjectResult)); } }