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test(spec): lazy sequences, transducers, metadata

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Add spec suites covering lazy-seq/lazy-cat laziness, infinite + self-referential
seqs (ones/nats/fib), realized?; transducers (map/filter/take/cat/keep/mapcat as
xforms, comp, into/transduce/sequence/eduction/completing); and metadata
(with-meta/meta/vary-meta/^ reader). All passed against jolt as written — no
implementation changes needed. jpm test green.
This commit is contained in:
Yogthos 2026-06-05 00:26:44 -04:00
parent a24e9bfba0
commit e3d2aa8d14
3 changed files with 70 additions and 0 deletions
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test/spec/lazy-seqs-spec.janet Normal file
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# Specification: lazy sequences.
(use ../support/harness)
(defspec "lazy / construction & laziness"
["lazy-seq value" "[1 2 3]" "(take 3 (lazy-seq (cons 1 (lazy-seq (cons 2 (lazy-seq (cons 3 nil)))))))"]
["not eagerly evaluated" "0" "(let [c (atom 0)] (lazy-seq (swap! c inc) nil) @c)"]
["realized on demand" "1" "(let [c (atom 0) s (lazy-seq (swap! c inc) [1])] (first s) @c)"]
["lazy-cat" "[0 1 2 3]" "(lazy-cat [0 1] [2 3])"]
["doall forces" "[2 3 4]" "(doall (map inc [1 2 3]))"]
["dorun returns nil" "nil" "(dorun (map inc [1 2 3]))"])
(defspec "lazy / infinite"
["take from repeat" "[7 7 7]" "(take 3 (repeat 7))"]
["take from iterate" "[1 2 4 8]" "(take 4 (iterate (fn [x] (* 2 x)) 1))"]
["take from cycle" "[1 2 1 2]" "(take 4 (cycle [1 2]))"]
["take from range" "[0 1 2]" "(take 3 (range))"]
["drop then take" "[5 6 7]" "(take 3 (drop 5 (range)))"]
["filter infinite" "[0 2 4]" "(take 3 (filter even? (range)))"]
["map infinite" "[0 1 4]" "(take 3 (map (fn [x] (* x x)) (range)))"]
["nth of infinite" "100" "(nth (range) 100)"])
(defspec "lazy / self-referential"
["self-ref ones" "[1 1 1 1 1]" "(do (def ones (lazy-seq (cons 1 ones))) (take 5 ones))"]
["self-ref nats" "[0 1 2 3 4]" "(do (def nats (lazy-cat [0] (map inc nats))) (take 5 nats))"]
["self-ref fib" "[0 1 1 2 3 5 8 13 21 34]"
"(do (def fib (lazy-cat [0 1] (map + (rest fib) fib))) (take 10 fib))"])
(defspec "lazy / realized?"
["unrealized" "false" "(realized? (lazy-seq (cons 1 nil)))"]
["realized after" "true" "(let [s (lazy-seq (cons 1 nil))] (first s) (realized? s))"])

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# Specification: metadata.
(use ../support/harness)
(defspec "metadata / with-meta & meta"
["meta of bare value" "nil" "(meta [1 2 3])"]
["with-meta then meta" "{:a 1}" "(meta (with-meta [1 2 3] {:a 1}))"]
["with-meta preserves value" "true" "(= [1 2 3] (with-meta [1 2 3] {:a 1}))"]
["with-meta on map" "{:doc \"x\"}" "(meta (with-meta {:k 1} {:doc \"x\"}))"]
["vary-meta" "{:a 2}" "(meta (vary-meta (with-meta [1] {:a 1}) update :a inc))"]
["meta reader ^" "{:tag :int}" "(meta ^{:tag :int} [1 2])"]
["with-meta on fn ok" "true" "(fn? (with-meta inc {:a 1}))"])

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# Specification: transducers.
(use ../support/harness)
(defspec "transducers / into"
["map xform" "[2 3 4]" "(into [] (map inc) [1 2 3])"]
["filter xform" "[2 4]" "(into [] (filter even?) [1 2 3 4])"]
["remove xform" "[1 3]" "(into [] (remove even?) [1 2 3 4])"]
["take xform" "[1 2]" "(into [] (take 2) [1 2 3 4])"]
["drop xform" "[3 4]" "(into [] (drop 2) [1 2 3 4])"]
["take-while xform" "[1 2]" "(into [] (take-while (fn [x] (< x 3))) [1 2 3 1])"]
["keep xform" "[1 3]" "(into [] (keep (fn [x] (if (odd? x) x nil))) [1 2 3 4])"]
["map-indexed xform" "[[0 :a] [1 :b]]" "(into [] (map-indexed vector) [:a :b])"]
["mapcat xform" "[1 1 2 2]" "(into [] (mapcat (fn [x] [x x])) [1 2])"]
["cat xform" "[1 2 3 4]" "(into [] cat [[1 2] [3 4]])"]
["into a set" "#{2 3 4}" "(into #{} (map inc) [1 2 3])"])
# transducer comp applies left-to-right: (comp (map a) (filter b)) maps then filters
(defspec "transducers / compose"
["comp map+filter" "[2 4 6 8]" "(into [] (comp (map (fn [x] (* x 2))) (filter even?)) [1 2 3 4])"]
["comp filter+map" "[2 4]" "(into [] (comp (filter odd?) (map inc)) [1 2 3 4])"]
["comp three" "[2]" "(into [] (comp (map inc) (filter even?) (take 1)) [1 2 3 4])"])
(defspec "transducers / transduce & sequence"
["transduce sum" "9" "(transduce (map inc) + [1 2 3])"]
["transduce init" "19" "(transduce (map inc) + 10 [1 2 3])"]
["transduce filter" "6" "(transduce (filter even?) + [1 2 3 4])"]
["sequence xform" "[2 3 4]" "(sequence (map inc) [1 2 3])"]
["eduction" "[2 3 4]" "(into [] (eduction (map inc) [1 2 3]))"]
["completing" "9" "(transduce (map inc) (completing +) 0 [1 2 3])"])