public async Task Given_DeleteGrade_When_IdIsValid_Then_OkStatusCode()
{
//Arrange
/*mockRepo
* .Setup(g => g.Delete(It.IsAny<Guid>()))
* .ReturnsAsync(true);*/
mockRepo
.Setup(g => g.FindById(It.IsAny <Guid>()))
.ReturnsAsync(new GradeDetailsModel());
//Act
var result = await controller.DeleteGrade(It.IsAny <Guid>());
//Assert
Assert.IsType <OkObjectResult>(result);
}