book-store: Add test that requires use of both groups of 4 and groups of 5#1620

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sswingle wants to merge 2 commits intoexercism:mainfrom sswingle:add_book_store_test

+19-1

Commits on Nov 24, 2019

add test for book store that requires use of 4 and 5 groups
sswingle
committed

Commits on Nov 26, 2019

add test for book store that gives books in shuffled order
sswingle
committed