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rose-ash/lib/feed/tests/fanout.sx
giles 915f51b2b6
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feed: Phase 2 fanout via outer product — activities ∘.× audience, flatten, edge-guard, dedupe + 29 tests
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-06 16:40:34 +00:00

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; Phase 2 — fanout via outer product + dedupe. (feed-test name got expected)
; ---------- graph ----------
; edges: (follower followee). bob,carol follow alice; carol,dave follow bob.
(define
G
(feed/follow-graph
(list
(list "bob" "alice")
(list "carol" "alice")
(list "carol" "bob")
(list "dave" "bob"))))
(feed-test "followers alice" (feed/followers G "alice") (list "bob" "carol"))
(feed-test "followers bob" (feed/followers G "bob") (list "carol" "dave"))
(feed-test "followers unknown" (feed/followers G "zzz") (list))
(feed-test "audience distinct" (feed/audience G) (list "bob" "carol" "dave"))
; ---------- fanout ----------
(define
S
(feed/stream
(list
(feed/activity "alice" "post" "p1" 10 (list))
(feed/activity "alice" "post" "p2" 20 (list))
(feed/activity "bob" "like" "p1" 30 (list)))))
(define IB (feed/fanout S G))
(feed-test "fanout total edges" (feed/count IB) 6)
(feed-test
"inbox bob count"
(feed/count (feed/inbox-for IB "bob"))
2)
(feed-test
"inbox carol count"
(feed/count (feed/inbox-for IB "carol"))
3)
(feed-test
"inbox dave count"
(feed/count (feed/inbox-for IB "dave"))
1)
(feed-test
"inbox alice (follows none)"
(feed/count (feed/inbox-for IB "alice"))
0)
(feed-test
"recipients order"
(feed/recipients IB)
(list "bob" "carol" "dave"))
(feed-test
"bob inbox objects"
(map (fn (a) (get a :object)) (feed/inbox-activities IB "bob"))
(list "p1" "p2"))
(feed-test
"dave inbox objects"
(map (fn (a) (get a :object)) (feed/inbox-activities IB "dave"))
(list "p1"))
(feed-test
"dave inbox verb"
(map (fn (a) (get a :verb)) (feed/inbox-activities IB "dave"))
(list "like"))
; empty graph → no audience → no edges
(feed-test
"empty graph fanout"
(feed/count (feed/fanout S {}))
0)
; actor nobody follows produces no edges
(define
Sghost
(feed/stream (list (feed/activity "ghost" "post" "g1" 5 (list)))))
(feed-test
"unfollowed actor fanout"
(feed/count (feed/fanout Sghost G))
0)
; ---------- high fanout (popular actor) ----------
(define
Gstar
(feed/follow-graph
(list
(list "u1" "star")
(list "u2" "star")
(list "u3" "star")
(list "u4" "star")
(list "u5" "star"))))
(define
Sstar
(feed/stream (list (feed/activity "star" "post" "s1" 1 (list)))))
(feed-test
"star fanout count"
(feed/count (feed/fanout Sstar Gstar))
5)
(feed-test "star audience size" (len (feed/audience Gstar)) 5)
; ---------- mutual follow ----------
(define Gmut (feed/follow-graph (list (list "a" "b") (list "b" "a"))))
(define
Smut
(feed/stream
(list
(feed/activity "a" "post" "pa" 1 (list))
(feed/activity "b" "post" "pb" 2 (list)))))
(define IBmut (feed/fanout Smut Gmut))
(feed-test "mutual total" (feed/count IBmut) 2)
(feed-test
"mutual a gets pb"
(map (fn (x) (get x :object)) (feed/inbox-activities IBmut "a"))
(list "pb"))
(feed-test
"mutual b gets pa"
(map (fn (x) (get x :object)) (feed/inbox-activities IBmut "b"))
(list "pa"))
; ---------- dedupe ----------
(define
Sdup2
(feed/stream
(list
(feed/activity "alice" "post" "p1" 1 (list))
(feed/activity "alice" "post" "p1" 9 (list))
(feed/activity "alice" "post" "p2" 2 (list)))))
(feed-test
"dedupe-activities collapses dup"
(feed/count (feed/dedupe-activities Sdup2))
2)
(feed-test
"dedupe-activities keeps distinct"
(map
(fn (a) (get a :object))
(feed/items (feed/dedupe-activities Sdup2)))
(list "p1" "p2"))
(define
Slikes
(feed/stream
(list
(feed/activity "alice" "like" "X" 1 (list))
(feed/activity "bob" "like" "X" 2 (list))
(feed/activity "carol" "like" "Y" 3 (list)))))
(feed-test
"collapse cross-actor likes"
(feed/count (feed/dedupe-collapse Slikes))
2)
(feed-test
"collapse keeps distinct objects"
(map
(fn (a) (get a :object))
(feed/items (feed/dedupe-collapse Slikes)))
(list "X" "Y"))
(feed-test
"activity-key shape"
(feed/activity-key (feed/activity "a" "post" "o" 0 (list)))
(list "a" "post" "o"))
(feed-test
"collapse-key shape"
(feed/collapse-key (feed/activity "a" "like" "o" 0 (list)))
(list "like" "o"))
; cross-post: alice posts p1 twice → bob's inbox has it twice → dedupe-inbox → once
(define
Scross
(feed/stream
(list
(feed/activity "alice" "post" "p1" 1 (list))
(feed/activity "alice" "post" "p1" 5 (list)))))
(define IBcross (feed/fanout Scross G))
(feed-test
"cross-post raw bob count"
(feed/count (feed/inbox-for IBcross "bob"))
2)
(feed-test
"cross-post deduped bob count"
(feed/count (feed/inbox-for (feed/dedupe-inbox IBcross) "bob"))
1)
(feed-test
"dedupe-inbox keeps distinct receivers"
(feed/count (feed/dedupe-inbox IBcross))
2)