public void DeleteGrade()
{
//create the student
var newStudent = new Student()
{
FirstName = "Mikesh",
LastName = "Mistry"
};
//add the student
studentRepository.Add(newStudent);
//Find the student
var foundStudent = studentRepository.GetAll().ToList();
//create a course
var newCourse = new Course()
{
Name = "Introduction To C# Programming",
Description = "Introduction To C# Programming"
};
//add the course to the database
courseRepository.Add(newCourse);
//find the course
var foundCourse = courseRepository.GetAll().ToList();
//create a new grade
var newGrade = new Grade()
{
Student = newStudent,
Course = newCourse,
LetterGrade = "A+"
};
//add the grade
gradeRepository.Add(newGrade);
//find the grade
var foundGrade = gradeRepository.Find(grade => grade.Student.StudentId == foundStudent[0].StudentId &&
grade.Course.CourseId == foundCourse[0].CourseId
).FirstOrDefault();
//test to see if we found the grade
Assert.IsNotNull(foundGrade);
//delete it
gradeRepository.Remove(newGrade);
foundGrade = gradeRepository.Find(grade => grade.Student.StudentId == foundStudent[0].StudentId &&
grade.Course.CourseId == foundCourse[0].CourseId
).FirstOrDefault();
//after deleting found grade should be null
Assert.IsNull(foundGrade);
}