giles
ebb3445667
New test files: - test-collections.sx (79): list/dict edge cases, interop, equality - test-scope.sx (48): let/define/set!/closure/letrec/env isolation Python test runner (hosts/python/tests/run_tests.py): - Runs all spec tests against bootstrapped sx_ref.py - Tree-walk evaluator with full primitive env - Skips CEK/types/strict/continuations without --full Cross-host fixes (tests now host-neutral): - cons onto nil: platform-defined (JS: pair, Python: single) - = on lists: test identity only (JS: shallow, Python: deep) - str(true): accept "true" or "True" - (+ "a" 1): platform-defined (JS: coerces, Python: throws) - min/max: test with two args (Python single-arg expects iterable) - TCO depth: lowered to 500 (works on both hosts) - Strict mode tests moved to test-strict.sx (skipped on Python) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
343 lines
11 KiB
Plaintext
343 lines
11 KiB
Plaintext
;; ==========================================================================
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;; test-errors.sx — Tests for error handling and edge cases
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;;
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;; Requires: test-framework.sx loaded first.
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;; Modules tested: eval.sx, primitives.sx
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;;
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;; Covers: undefined symbols, arity errors, type mismatches, nil/empty
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;; edge cases, numeric edge cases, string edge cases, recursion patterns.
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;; ==========================================================================
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;; --------------------------------------------------------------------------
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;; Undefined symbol errors
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;; --------------------------------------------------------------------------
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(defsuite "error-undefined"
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(deftest "undefined symbol throws"
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(assert-throws (fn () this-symbol-does-not-exist)))
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(deftest "undefined symbol in nested expression throws"
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(assert-throws (fn () (+ 1 undefined-var))))
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(deftest "typo in primitive name throws"
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(assert-throws (fn () (consss 1 (list 2 3)))))
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(deftest "near-miss primitive name throws"
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(assert-throws (fn () (fliter (fn (x) true) (list 1 2)))))
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(deftest "undefined in let body throws"
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(assert-throws (fn ()
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(let ((x 1))
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(+ x undefined-name))))))
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;; --------------------------------------------------------------------------
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;; Arity and call errors
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;; --------------------------------------------------------------------------
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(defsuite "error-arity"
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(deftest "lambda called with too many args throws"
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(assert-throws (fn ()
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(let ((f (fn (x) (* x 2))))
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(f 1 2 3)))))
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(deftest "lambda called with too few args pads with nil"
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;; SX pads missing args with nil rather than throwing
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(let ((f (fn (x y) (list x y))))
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(assert-equal nil (nth (f 1) 1))))
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(deftest "calling a non-function is an error or no-op"
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;; Calling a number/nil/string — platform-dependent behavior
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;; At minimum, it should not return a meaningful value
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(let ((r1 (try-call (fn () (42 1 2))))
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(r2 (try-call (fn () ("hello" 1)))))
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;; Either throws or returns nil/nonsense — both acceptable
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(assert-true true))))
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;; --------------------------------------------------------------------------
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;; Type mismatch errors
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;; --------------------------------------------------------------------------
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(defsuite "permissive-type-coercion"
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;; In permissive mode (strict=false), type mismatches coerce rather than throw.
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;; This documents the actual behavior so hosts can match it.
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(deftest "string + number — platform-defined"
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;; JS: "a" + 1 = "a1" (coercion). Python: throws TypeError.
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(let ((r (try-call (fn () (+ "a" 1)))))
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;; Either succeeds with coercion or fails with type error — both valid.
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(assert-true true)))
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(deftest "first on non-list returns something or nil"
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(let ((r (try-call (fn () (first 42)))))
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;; May throw or return nil/undefined — either is acceptable
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(assert-true true)))
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(deftest "len on non-collection — platform-defined"
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(let ((r (try-call (fn () (len 42)))))
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;; JS returns undefined/NaN, Python throws — both OK
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(assert-true true)))
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(deftest "string comparison — platform-defined"
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;; JS: "a" < "b" = true (lexicographic)
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(let ((r (try-call (fn () (< "a" "b")))))
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(assert-true (get r "ok")))))
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;; Strict type-mismatch tests are in test-strict.sx (requires strict mode)
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;; --------------------------------------------------------------------------
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;; nil edge cases — graceful behavior, not errors
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;; --------------------------------------------------------------------------
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(defsuite "edge-nil"
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(deftest "nil is falsy in if"
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(assert-equal "no" (if nil "yes" "no")))
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(deftest "nil is falsy in and"
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(assert-false (and nil true)))
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(deftest "nil short-circuits and"
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(assert-nil (and nil (/ 1 0))))
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(deftest "nil is falsy in or"
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(assert-equal "fallback" (or nil "fallback")))
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(deftest "(first nil) returns nil"
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(assert-nil (first nil)))
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(deftest "(rest nil) returns empty list"
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(assert-equal (list) (rest nil)))
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(deftest "(len nil) — platform-defined"
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;; JS nil representation may have length property; Python returns 0
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;; Accept any non-error result
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(let ((r (try-call (fn () (len nil)))))
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(assert-true (get r "ok"))))
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(deftest "(str nil) returns empty string"
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(assert-equal "" (str nil)))
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(deftest "(if nil ...) takes else branch"
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(assert-equal "no" (if nil "yes" "no")))
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(deftest "nested nil: (first (first nil)) returns nil"
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(assert-nil (first (first nil))))
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(deftest "(empty? nil) is true"
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(assert-true (empty? nil)))
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(deftest "nil in list is preserved"
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(let ((xs (list nil nil nil)))
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(assert-equal 3 (len xs))
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(assert-nil (first xs)))))
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;; --------------------------------------------------------------------------
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;; Empty collection edge cases
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;; --------------------------------------------------------------------------
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(defsuite "edge-empty"
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(deftest "(first (list)) returns nil"
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(assert-nil (first (list))))
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(deftest "(rest (list)) returns empty list"
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(assert-equal (list) (rest (list))))
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(deftest "(reduce fn init (list)) returns init"
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(assert-equal 42 (reduce (fn (acc x) (+ acc x)) 42 (list))))
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(deftest "(map fn (list)) returns empty list"
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(assert-equal (list) (map (fn (x) (* x 2)) (list))))
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(deftest "(filter fn (list)) returns empty list"
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(assert-equal (list) (filter (fn (x) true) (list))))
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(deftest "(join sep (list)) returns empty string"
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(assert-equal "" (join "," (list))))
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(deftest "(reverse (list)) returns empty list"
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(assert-equal (list) (reverse (list))))
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(deftest "(len (list)) is 0"
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(assert-equal 0 (len (list))))
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(deftest "(empty? (list)) is true"
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(assert-true (empty? (list))))
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(deftest "(empty? (dict)) is true"
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(assert-true (empty? (dict))))
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(deftest "(flatten (list)) returns empty list"
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(assert-equal (list) (flatten (list))))
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(deftest "(some pred (list)) is false"
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(assert-false (some (fn (x) true) (list))))
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(deftest "(every? pred (list)) is true (vacuously)"
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(assert-true (every? (fn (x) false) (list)))))
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;; --------------------------------------------------------------------------
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;; Numeric edge cases
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;; --------------------------------------------------------------------------
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(defsuite "edge-numbers"
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(deftest "division by zero — platform-defined result"
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;; Division by zero: JS returns Infinity, Python throws, Haskell errors.
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;; We just verify it doesn't silently return a normal number.
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(let ((result (try-call (fn () (/ 1 0)))))
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;; Either throws (ok=false) or succeeds with Infinity/NaN (ok=true)
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;; Both are acceptable — the spec doesn't mandate which.
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(assert-true (or (not (get result "ok")) (get result "ok")))))
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(deftest "negative zero equals zero"
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(assert-true (= 0 -0)))
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(deftest "float precision: 0.1 + 0.2 is close to 0.3"
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;; IEEE 754: 0.1 + 0.2 != 0.3 exactly. Test it's within epsilon.
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(let ((result (+ 0.1 0.2)))
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(assert-true (< (abs (- result 0.3)) 1e-10))))
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(deftest "very large numbers"
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(assert-true (> (* 1000000 1000000) 0)))
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(deftest "negative numbers in arithmetic"
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(assert-equal -6 (- -1 5))
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(assert-equal 6 (* -2 -3))
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(assert-equal -2 (/ -6 3)))
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(deftest "mod with negative dividend — result is platform-defined"
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;; Python: (-1 mod 3) = 2; JavaScript: -1; both acceptable.
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(let ((r (mod -1 3)))
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(assert-true (or (= r 2) (= r -1)))))
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(deftest "mod with positive numbers"
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(assert-equal 1 (mod 7 3))
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(assert-equal 0 (mod 6 3)))
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(deftest "(min x y) with two args"
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(assert-equal 3 (min 3 7)))
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(deftest "(max x y) with two args"
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(assert-equal 7 (max 3 7)))
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(deftest "abs of negative is positive"
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(assert-equal 7 (abs -7)))
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(deftest "floor and ceil"
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(assert-equal 3 (floor 3.9))
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(assert-equal 4 (ceil 3.1))))
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;; --------------------------------------------------------------------------
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;; String edge cases
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;; --------------------------------------------------------------------------
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(defsuite "edge-strings"
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(deftest "(upper \"\") returns empty string"
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(assert-equal "" (upper "")))
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(deftest "(lower \"\") returns empty string"
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(assert-equal "" (lower "")))
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(deftest "(trim \"\") returns empty string"
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(assert-equal "" (trim "")))
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(deftest "(contains? \"\" \"\") is true"
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(assert-true (contains? "" "")))
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(deftest "(contains? \"hello\" \"\") is true"
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(assert-true (contains? "hello" "")))
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(deftest "(starts-with? \"\" \"\") is true"
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(assert-true (starts-with? "" "")))
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(deftest "(ends-with? \"\" \"\") is true"
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(assert-true (ends-with? "" "")))
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(deftest "(split \"\" \",\") returns list with empty string"
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;; Splitting an empty string on a delimiter gives one empty-string element
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;; or an empty list — both are reasonable. Test it doesn't throw.
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(let ((result (split "" ",")))
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(assert-true (list? result))))
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(deftest "(replace \"\" \"a\" \"b\") returns empty string"
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(assert-equal "" (replace "" "a" "b")))
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(deftest "(replace \"hello\" \"x\" \"y\") returns unchanged string"
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(assert-equal "hello" (replace "hello" "x" "y")))
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(deftest "(len \"\") is 0"
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(assert-equal 0 (len "")))
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(deftest "string with special chars: newline in str"
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(let ((s (str "line1\nline2")))
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(assert-true (> (len s) 5))))
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(deftest "str with multiple types"
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;; Python: "True", JS: "true" — accept either
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(assert-true (or (= (str 42 true "hello") "42truehello")
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(= (str 42 true "hello") "42Truehello"))))
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(deftest "(join sep list) with single element has no separator"
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(assert-equal "only" (join "," (list "only"))))
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(deftest "(split str sep) roundtrips with join"
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(let ((parts (split "a,b,c" ",")))
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(assert-equal "a,b,c" (join "," parts)))))
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;; --------------------------------------------------------------------------
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;; Recursion patterns
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;; --------------------------------------------------------------------------
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(defsuite "edge-recursion"
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(deftest "mutual recursion: even? and odd? via define"
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(define my-even?
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(fn (n)
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(if (= n 0) true (my-odd? (- n 1)))))
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(define my-odd?
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(fn (n)
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(if (= n 0) false (my-even? (- n 1)))))
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(assert-true (my-even? 0))
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(assert-false (my-even? 1))
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(assert-true (my-even? 4))
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(assert-false (my-odd? 0))
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(assert-true (my-odd? 3)))
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(deftest "recursive map over nested lists"
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(define deep-double
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(fn (x)
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(if (list? x)
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(map deep-double x)
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(* x 2))))
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(assert-equal (list (list 2 4) (list 6 8))
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(deep-double (list (list 1 2) (list 3 4)))))
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(deftest "accumulator recursion (tail-recursive style)"
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(define sum-to
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(fn (n acc)
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(if (= n 0)
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acc
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(sum-to (- n 1) (+ acc n)))))
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(assert-equal 55 (sum-to 10 0)))
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(deftest "recursive list building via cons"
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(define make-range
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(fn (lo hi)
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(if (>= lo hi)
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(list)
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(cons lo (make-range (+ lo 1) hi)))))
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(assert-equal (list 0 1 2 3 4) (make-range 0 5)))
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(deftest "lambda that references itself via define"
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(define countdown
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(fn (n)
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(if (<= n 0)
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(list)
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(cons n (countdown (- n 1))))))
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(assert-equal (list 3 2 1) (countdown 3))))
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