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test-utility.rkt
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test-utility.rkt
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#lang racket
(require rackunit
"utility.rkt")
(test-case "Empty permutation"
(check-equal? (permute-lists) '()))
(test-case "Trivial permutation"
(check-equal? (permute-lists '(a b)) '((a) (b))))
(test-case "Dual permutation"
(check-equal? (permute-lists '(c d) '(a b)) '((c a) (c b) (d a) (d b))))
(test-case "Triple permutation"
(check-equal?
(permute-lists '(a b) '(c d) '(e f g))
'((a c e) (a c f) (a c g) (a d e) (a d f) (a d g)
(b c e) (b c f) (b c g) (b d e) (b d f) (b d g) )))
(test-case "Non-trivial permutations with empty lists"
(check-equal? (permute-lists '() '(c d) '(a b)) '())
(check-equal? (permute-lists '(c d) '() '(a b)) '())
(check-equal? (permute-lists '(c d) '(a b) '()) '()))