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(((srfi srfi-41 util) stream-paginate)
((srfi srfi-41) stream->list stream-ref stream-from
stream-filter stream-car stream)
((ice-9 sandbox) call-with-time-limit)
)
(test-equal "Finite stream"
'((0 1 2) (3 4 5) (6 7 8) (9))
(let ((strm
(stream-paginate (stream 0 1 2 3 4 5 6 7 8 9)
3)))
(map stream->list (stream->list strm))))
(test-equal "slice of infinite"
'(1000 1001 1002 1003 1004 1005 1006 1007 1008 1009)
(let ((strm (stream-paginate (stream-from 0))))
(stream->list (stream-ref strm 100))))
(define unique-symbol (gensym))
(test-equal "time out on infinite 'empty' stream"
unique-symbol
;; defined outside time limit since creation should always
;; succeed. Only reference is expected to fail.
(let ((strm (stream-paginate
;; easy way to get stream which never finds
;; any elements.
(stream-filter negative? (stream-from 0)))))
(call-with-time-limit
0.1
(lambda () (stream-car strm))
(lambda _ unique-symbol))))
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