public void AddComment() { Patient patient = new Patient(1, "username", "email", "password", "name", DateTime.Today, "phonenumber", true, Gender.Female, 23); Doctor doctor = new Doctor(1, "username", "email", "password", "name", DateTime.Today, "phonenumber", true, Gender.Female); TreatmentType treatmentType = new TreatmentType("name", "description"); Treatment treatment = new Treatment(1, "name", DateTime.MinValue, DateTime.Today, patient, doctor, treatmentType); Comment comment = new Comment("title", "description", DateTime.Today); Comment comment2 = new Comment("title", "description", DateTime.Today); treatment.AddComment(comment); treatment.AddComment(comment2); Assert.True(treatment.Comments.Exists(c => c == comment)); Assert.Equal(2, treatment.Comments.Count); }