public async Task Given_DeleteExam_When_IdIsValid_Then_OkStatusCode()
{
//Arrange
/*mockRepo
* .Setup(e => e.Delete(It.IsAny<Guid>()))
* .ReturnsAsync(true);
*/
mockRepo
.Setup(u => u.FindById(It.IsAny <Guid>()))
.ReturnsAsync(new ExamDetailsModel());
//Act
var result = await controller.DeleteExam(It.IsAny <Guid>());
//Assert
Assert.IsType <OkObjectResult>(result);
}