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(import (scheme base)
(only (csc testing) define-test errorf)
(csc list))
(define-test (test-take t)
(define-record-type <test-case>
(test-case desc n xs want)
test-case?
(desc desc)
(n n)
(xs xs)
(want want))
(let ((tests (list
(test-case
"simple"
3
'(1 2 3 4 5)
'(1 2 3))
(test-case
"negative"
-5
'(1 2 3)
'())
(test-case
"zero"
0
'(1 2 3)
'())
(test-case
"short list"
5
'(1 2 3)
'(1 2 3))
(test-case
"take whole list"
3
'(1 2 3)
'(1 2 3)))))
(for-each
(lambda (tc)
(let ((got (take (n tc) (xs tc))))
(unless (equal? got (want tc))
(errorf t "(got {} {}) = {}, want {}." (n tc) (xs tc) got (want tc)))))
tests)))
(define-test (test-split-at t)
(define-record-type <test-case>
(test-case desc n xs want-a want-b)
test-case?
(desc desc)
(n n)
(xs xs)
(want-a want-a)
(want-b want-b))
(let ((tests (list
(test-case
"simple"
2
'(1 2 3 4)
'(1 2)
'(3 4))
(test-case
"negative"
-5
'(1 2 3)
'()
'(1 2 3))
(test-case
"zero"
0
'(1 2 3)
'()
'(1 2 3))
(test-case
"short list"
5
'(1 2 3)
'(1 2 3)
'())
(test-case
"whole list"
3
'(1 2 3)
'(1 2 3)
'()))))
(for-each
(lambda (tc)
(let-values (((got-a got-b) (split-at (n tc) (xs tc))))
(unless (equal? got-a (want-a tc))
(errorf t "(split-at {} {}) = (values {}, _), want {}." (n tc) (xs tc) got-a (want-a tc)))
(unless (equal? got-b (want-b tc))
(errorf t "(split-at {} {}) = (values _, {}), want {}." (n tc) (xs tc) got-b (want-b tc)))))
tests)))
(define-test (test-revappend t)
(define-record-type <test-case>
(test-case desc a b want)
test-case?
(desc desc)
(a a)
(b b)
(want want))
(let ((tests (list
(test-case
"threes"
'(3 2 1)
'(4 5 6)
'(1 2 3 4 5 6))
(test-case
"empty first list"
'()
'(1 2 3)
'(1 2 3))
(test-case
"empty second list"
'(3 2 1)
'()
'(1 2 3)))))
(for-each
(lambda (tc)
(let ((got (revappend (a tc) (b tc))))
(unless (equal? got (want tc))
(errorf t "(revappend {} {}) = {}, want {}." (a tc) (b tc) got (want tc)))))
tests)))
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