def create_test_course(name, owner, instructors=(), students=()):
course = Course()
course.name = name
course.owner = owner
course.save()
course.instructors.add(*instructors)
course.students.add(*students)
def open_course(owner, name, short_description=None):
course = Course()
course.owner = owner
course.name = name
if short_description is not None:
course.short_description = short_description
course.save()
return course
