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(fresh (x y z) g1 g2 ...) expands to a let that calls (make-var) for each named var, then mk-conjs the goals. call-fresh is the function-shaped alternative for programmatic goal building. 9 new tests: empty-vars, single var, multi-var multi-goal, fresh under disj, nested fresh, call-fresh equivalents. 91/91 cumulative.
102 lines
1.9 KiB
Plaintext
102 lines
1.9 KiB
Plaintext
;; lib/minikanren/tests/fresh.sx — Phase 2 piece B tests for `fresh`.
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;; --- empty fresh: pure goal grouping ---
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(mk-test
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"fresh-empty-vars-equiv-conj"
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((fresh () (== 1 1)) empty-s)
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(list empty-s))
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(mk-test
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"fresh-empty-vars-no-goals-is-succeed"
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((fresh ()) empty-s)
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(list empty-s))
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;; --- single var ---
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(mk-test
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"fresh-one-var-bound"
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(let
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((s (first ((fresh (x) (== x 7)) empty-s))))
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(let ((vs (vals s))) (first vs)))
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7)
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;; --- multiple vars + multiple goals ---
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(mk-test
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"fresh-two-vars-three-goals"
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(let
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((q (mk-var "q"))
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(g
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(fresh
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(x y)
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(== x 10)
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(== y 20)
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(== q (list x y)))))
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(mk-walk* q (first (g empty-s))))
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(list 10 20))
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(mk-test
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"fresh-three-vars"
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(let
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((q (mk-var "q"))
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(g
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(fresh
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(a b c)
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(== a 1)
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(== b 2)
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(== c 3)
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(== q (list a b c)))))
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(mk-walk* q (first (g empty-s))))
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(list 1 2 3))
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;; --- fresh interacts with disj ---
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(mk-test
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"fresh-with-disj"
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(let
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((q (mk-var "q")))
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(let
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((g (fresh (x) (mk-disj (== x 1) (== x 2)) (== q x))))
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(let
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((res (stream-take 5 (g empty-s))))
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(map (fn (s) (mk-walk q s)) res))))
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(list 1 2))
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;; --- nested fresh ---
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(mk-test
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"fresh-nested"
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(let
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((q (mk-var "q"))
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(g
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(fresh
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(x)
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(fresh
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(y)
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(== x 1)
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(== y 2)
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(== q (list x y))))))
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(mk-walk* q (first (g empty-s))))
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(list 1 2))
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;; --- call-fresh (functional alternative) ---
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(mk-test
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"call-fresh-binds-and-walks"
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(let
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((s (first ((call-fresh (fn (x) (== x 99))) empty-s))))
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(first (vals s)))
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99)
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(mk-test
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"call-fresh-distinct-from-outer-vars"
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(let
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((q (mk-var "q")))
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(let
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((g (call-fresh (fn (x) (mk-conj (== x 5) (== q (list x x)))))))
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(mk-walk* q (first (g empty-s)))))
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(list 5 5))
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(mk-tests-run!)
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