public async Task Given_GetProfessors_When_ThereAreNoProfessors_Then_OkStatusCode()
{
//Arrange
mockRepo.Setup(p => p.GetAll()).ReturnsAsync(new List <ProfessorDetailsModel>());
// Act
var result = await controller.GetProfessors();
// Assert
Assert.IsType <OkObjectResult>(result);
}