public void CreateStudent_AddNewStudentElementInXML()
{
//arrrange
StudentsContext context = new StudentsContext();
int maxId = context.xDoc.Root.Elements("Student").Max(s => (int)s.Attribute("Id"));
Student newStudent = new Student()
{
Id = ++maxId,
FirstName = "Smit",
Last = "Uilson",
Age = "32",
Gender = "0"
};
//Act
context.CreateStudent(newStudent);
bool exist = context.xDoc.Root.Elements("Student").Any(s => (int)s.Attribute("Id") == newStudent.Id);
//Assert
Assert.IsTrue(exist);
}