The drawer's props plus the entities the assertions need
Remarks
Deliberately hands over no position reading. The drawer derives
Module · Lesson N of M itself from modules and lessonsByModuleId, so a
fixture that supplied it would route the tests around the code path
production takes.
Builds a course of
lessonsPerModule.lengthmodules, with the current lesson placed atcurrentLessonIndexinside the module atcurrentModuleIndex.