(import (scheme base)
        (only (csc testing) assert assert-equal test)
        (csc list))


(test take-simple
  (assert-equal '(1 2 3) (take 3 '(1 2 3 4 5))))


(test take-negative
  (assert-equal '() (take -5 '(1 2 3))))


(test take-zero
  (assert-equal '() (take 0 '(1 2 3))))


(test take-short-list
  (assert-equal '(1 2 3) (take 5 '(1 2 3))))


(test take-whole-list
  (assert-equal '(1 2 3) (take 3 '(1 2 3))))


(define-syntax values=
  (syntax-rules ()
    ((values= x y)
     (let-values (((x-a x-b) x)
                  ((y-a y-b) y))
       (and (equal? x-a y-a) (equal? x-b y-b))))))


(test split-at-simple
  (assert (values= (values '(1 2) '(3 4)) (split-at 2 '(1 2 3 4)))))


(test split-at-negative
  (assert (values= (values '() '(1 2 3)) (split-at -5 '(1 2 3)))))


(test split-at-zero
  (assert (values= (values '() '(1 2 3)) (split-at 0 '(1 2 3)))))


(test split-at-short-list
  (assert (values= (values '(1 2 3) '()) (split-at 5 '(1 2 3)))))


(test split-at-whole-list
  (assert (values= (values '(1 2 3) '()) (split-at 3 '(1 2 3)))))


(test revappend-threes
  (assert-equal '(1 2 3 4 5 6) (revappend '(3 2 1) '(4 5 6))))


(test revappend-empty-first-list
  (assert-equal '(1 2 3) (revappend '() '(1 2 3))))


(test revappend-empty-second-list
  (assert-equal '(1 2 3) (revappend '(3 2 1) '())))


(test intercalate-simple
  (assert-equal '("a" "," "b" "," "c") (intercalate "," '("a" "b" "c"))))


(test intercalate-empty
  (assert-equal '() (intercalate "," '())))


(test intercalate-singleton
  (assert-equal '(1) (intercalate "," '(1))))


(test enumerate-simple
  (assert-equal '((0 . a) (1 . b) (2 . c) (3 . d)) (enumerate '(a b c d))))


(test enumerate-nil
  (assert-equal '() (enumerate '())))


(test enumerate-singleton
  (assert-equal '((0 . "test")) (enumerate '("test"))))


(test filter-even
  (assert-equal '(0 2 4 6 8) (filter even? '(0 1 2 3 4 5 6 7 8 9))))


(test filter-odd
  (assert-equal '(1 3 5 7 9) (filter odd? '(0 1 2 3 4 5 6 7 8 9))))


(test unzip-empty
  (assert (values= (values '() '()) (unzip '()))))


(test unzip-simple
  (assert (values= (values '(1 2 3) '(4 5 6)) (unzip '((1 . 4) (2 . 5) (3 . 6))))))


(test all-even
  (assert-equal
    #t
    (all (lambda (x) (= 0 (remainder x 2))) '(2 12 8))))


(test some-odd
  (assert-equal
    #f
    (all (lambda (x) (= 0 (remainder x 2))) '(2 13 8))))


(test all-equal
  (assert-equal
    #t
    (all = '(1 2 3) '(1 2 3))))