(define (test-cond x)
  (cond ((< 0 x) +1)
        ((> 0 x) -1)
        (else 0)))

(assert (= (test-cond 10)  1))
(assert (= (test-cond 1)   1))
(assert (= (test-cond 123) 1))

(assert (= (test-cond -10)  -1))
(assert (= (test-cond -1)   -1))
(assert (= (test-cond -123) -1))

(assert (= (test-cond  0) 0))
(assert (= (test-cond -0) 0))
(assert (= (test-cond +0) 0))


(define (test-case x)
  (case x
    ((a b 3) 1)
    ((4 5 6) -1)
    (else 'xD)))


(assert (= (test-case 'a) 1))
(assert (= (test-case 'b) 1))
(assert (= (test-case 3)  1))

(assert (= (test-case 4) -1))
(assert (= (test-case 5) -1))
(assert (= (test-case 6) -1))

(assert (= (test-case 0)    'xD))
(assert (= (test-case 1)    'xD))
(assert (= (test-case :asd) 'xD))