test(LessonService): add test for LessonService (reverted from commit fd5117d21ac78c1aded7b5344558f038463ed52a)
test(LessonService): add test for LessonService (reverted from commit fd5117d21ac78c1aded7b5344558f038463ed52a)

VTurturika/interactive-schedule,VTurturika/interactive-schedule