public async Task Given_GetGradeByExamId_When_IdIsValid_Then_OkStatusCode()
{
//Arrange
var guid = new Guid("ef7e98df-26ed-4b21-b874-c3a2815d18ac");
//mockRepoGrade
// .Setup(e => e.FindByExamId(guid))
// .ReturnsAsync(new GradeDetailsModel());
// Act
var result = await controller.GetGradeByExamId(guid);
// Assert
Assert.IsType <OkObjectResult>(result);
}
