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rose-ash/lib/feed/tests/trending.sx
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feed: trending objects/actors by recent activity window, deterministic tiebreak + 11 tests
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-06 16:55:55 +00:00

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; Follow-up — trending objects/actors by recent activity. (feed-test name got expected)
; window (50,100]: X@60,X@70 (a), Y@80 (b), Z@90 (c); W@40 is too old
(define
S
(feed/stream
(list
(feed/activity "a" "post" "X" 60 (list))
(feed/activity "a" "post" "X" 70 (list))
(feed/activity "b" "post" "Y" 80 (list))
(feed/activity "c" "post" "Z" 90 (list))
(feed/activity "d" "post" "W" 40 (list)))))
; ---------- trending objects ----------
(feed-test
"trending count (3 in window)"
(len (feed/trending S 100 50 10))
3)
(feed-test
"trending top object"
(get
(nth (feed/trending S 100 50 10) 0)
:object)
"X")
(feed-test
"trending top count"
(get
(nth (feed/trending S 100 50 10) 0)
:count)
2)
(feed-test
"trending order (count desc, key asc tiebreak)"
(map
(fn (e) (get e :object))
(feed/trending S 100 50 10))
(list "X" "Y" "Z"))
(feed-test
"trending top-2"
(map
(fn (e) (get e :object))
(feed/trending S 100 50 2))
(list "X" "Y"))
(feed-test
"old object W excluded"
(feed/-elem?
"W"
(map
(fn (e) (get e :object))
(feed/trending S 100 50 10)))
false)
(feed-test
"narrow window keeps only newest"
(map
(fn (e) (get e :object))
(feed/trending S 100 15 10))
(list "Z"))
(feed-test
"empty window -> nothing"
(feed/trending S 100 5 10)
(list))
; ---------- trending actors ----------
(feed-test
"trending actor top"
(get
(nth (feed/trending-actors S 100 50 10) 0)
:actor)
"a")
(feed-test
"trending actor count"
(get
(nth (feed/trending-actors S 100 50 10) 0)
:count)
2)
(feed-test
"trending actors order"
(map
(fn (e) (get e :actor))
(feed/trending-actors S 100 50 10))
(list "a" "b" "c"))