public async void TestUpdateAsync() { var options = new DbContextOptionsBuilder <ApplicationDbContext>() .UseInMemoryDatabase(databaseName: "SubmissionDatabase") .Options; var dbContext = new ApplicationDbContext(options); var repo = new SubmissionRepository(dbContext); var newJson = "{id: 234}"; // Act var newSubmission = await repo.CreateAsync(new Submission { SavedDate = DateTime.Now, SubmissionJson = "{id: 123}" }); var id = newSubmission.Id; newSubmission.SubmissionJson = newJson; var result = await repo.UpdateAsync(id, newSubmission) as Submission; // Assert Assert.True(result.SubmissionJson == newJson); }