public async Task Given_GetGradeById_When_IdIsValid_Then_OkStatusCode() { //Arrange var guid = new Guid("ef7e98df-26ed-4b21-b874-c3a2815d18ac"); mockRepo .Setup(g => g.FindById(guid)) .ReturnsAsync(new GradeDetailsModel()); // Act var result = await controller.GetGradeById(guid); // Assert Assert.IsType <OkObjectResult>(result); }