public IExamApplication ApplyFor([NotNull] IExam exam)
{
ExamApplicationBuilder builder = new ExamApplicationBuilder();
builder.OnSubject(exam.OnSubject);
builder.AdministratedBy(exam.AdministratedBy);
builder.TakenBy(this);
IExamApplication application = builder.Build();
this.Exams.Add(application);
return(application);
//if (!CanApplyFor(exam))
// throw new ArgumentException();
//return new Implementation.ExamApplication(new Exam(exam.OnSubject, exam.AdministratedBy), this);
}
private bool CanAssignGrade(IExamApplication onExam) => onExam.Grade.Map(_ => false).Reduce(true);
private bool Validate(IExamApplication app) => true;
