public static CoursesCounter Random()
{
var existingCourses = ListMother <CourseId> .Random(CourseIdMother.Random);
return(Create(
CoursesCounterIdMother.Random(),
CoursesCounterTotalMother.Create(existingCourses.Count),
existingCourses
));
}
public static CoursesCounter Incrementing(
CoursesCounter existingCounter, CourseId courseId)
{
var existingCourses = new List <CourseId>(existingCounter.ExistingCourses);
existingCourses.Add(courseId);
return(Create(
existingCounter.Id,
CoursesCounterTotalMother.Create(existingCounter.Total.Value + 1),
existingCourses
));
}