public void Arrange()
{
_course = new Course("C# Fundamentals", 75m);
_course2 = new Course("Inheritance", 50m);
_course3 = new Course("C# Advanced", 80m);
_course4 = new Course("Contoso", 42m);
_courseRepository = new CourseRepository();
_courseRepository.AddCourseToRepository(_course);
_courseRepository.AddCourseToRepository(_course2);
_courseRepository.AddCourseToRepository(_course3);
_courseRepository.AddCourseToRepository(_course4);
_developerRepository = new DeveloperRepository();
//_developer = new Developer("John", new List<Course>(_course2, _course4), 25);
}