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(((datetime) date time)
((datetime util) month-stream in-date-range?)
((srfi srfi-41) stream->list stream-take
))
(test-assert "jan->dec"
(stream->list (stream-take 11 (month-stream #2020-01-01))))
(test-assert "dec->jan"
(stream->list (stream-take 2 (month-stream #2020-12-01))))
(test-assert "dec->feb"
(stream->list (stream-take 3 (month-stream #2020-12-01))))
(test-assert "20 months"
(stream->list (stream-take 20 (month-stream #2020-01-01))))
(test-equal "Correct months"
(list #2020-02-01 #2020-03-01 #2020-04-01 #2020-05-01 #2020-06-01 #2020-07-01 #2020-08-01 #2020-09-01 #2020-10-01 #2020-11-01 #2020-12-01 #2021-01-01)
(stream->list (stream-take 12 (month-stream #2020-02-01))))
(test-assert "in-date-range?"
(not ((in-date-range? #2020-01-01 #2020-02-29)
#2018-02-02)))
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