public void AddStudentTest()
{
// Arrange
var mockSet = new Mock <DbSet <Student> >();
var mockContext = new Mock <ExamDbContext>();
mockContext.Setup(m => m.Students).Returns(mockSet.Object);
// Result
var service = new StudentDbRepository(mockContext.Object);
service.AddStudent(_studentsdata.ElementAt(0));
// Assert
mockSet.Verify(m => m.Add(It.IsAny <Student>()), Times.Once());
mockContext.Verify(m => m.SaveChanges(), Times.Once());
}
