Course media and their items with inheritance #media_items_with_inheritance returns all items with their title and id Failure/Error: expect(@course.media_items_with_inheritance) .to match_array([["Bem. 1.2 ", item1.id], ["SS 20, Satz 3.4 ", item2.id], ["SS 20, Bsp. 5.6 ", item3.id], ["Worked Example, p-adische Zahlen", self_item1.id], ["SS 20, Worked Example, Gruppenring", self_item2.id], ["SS 20, Lektion, exakte Folge", self_item3.id]]) expected collection contained: [["Bem. 1.2 ", 12], ["SS 20, Bsp. 5.6 ", 14], ["SS 20, Lektion, exakte Folge", 11], ["SS 20, Satz 3.4 ", 13], ["SS 20, Worked Example, Gruppenring", 10], ["Worked Example, p-adische Zahlen", 9]] actual collection contained: [["Rem. 1.2 ", 12], ["SS 20, Ex. 5.6 ", 14], ["SS 20, Lesson, exakte Folge", 11], ["SS 20, Thm. 3.4 ", 13], ["SS 20, Worked Example, Gruppenring", 10], ["Worked Example, p-adische Zahlen", 9]] the missing elements were: [["Bem. 1.2 ", 12], ["SS 20, Bsp. 5.6 ", 14], ["SS 20, Lektion, exakte Folge", 11], ["SS 20, Satz 3.4 ", 13]] the extra elements were: [["Rem. 1.2 ", 12], ["SS 20, Ex. 5.6 ", 14], ["SS 20, Lesson, exakte Folge", 11], ["SS 20, Thm. 3.4 ", 13]]