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rose-ash/lib/haskell/tests/show.sx
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haskell: Phase 8 — tests/show.sx expanded to 26/26 (full audit coverage)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-05-07 01:04:52 +00:00

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;; show.sx — tests for the Show / Read class plumbing.
;;
;; Covers Phase 8:
;; - showsPrec / showParen / shows / showString stubs
;; - Read class stubs (reads / readsPrec / read)
;; - direct show coverage (Int, Bool, String, list, tuple, Maybe, ADT, ...)
;; ── ShowS / showsPrec / showParen stubs ──────────────────────
(hk-test
"shows: prepends show output"
(hk-deep-force (hk-run "main = shows 5 \"abc\""))
"5abc")
(hk-test
"shows: works on True"
(hk-deep-force (hk-run "main = shows True \"x\""))
"Truex")
(hk-test
"showString: prepends literal"
(hk-deep-force (hk-run "main = showString \"hello\" \" world\""))
"hello world")
(hk-test
"showParen True: wraps inner output in parens"
(hk-deep-force (hk-run "main = showParen True (showString \"inside\") \"\""))
"(inside)")
(hk-test
"showParen False: passes through unchanged"
(hk-deep-force (hk-run "main = showParen False (showString \"inside\") \"\""))
"inside")
(hk-test
"showsPrec: prepends show output regardless of prec"
(hk-deep-force (hk-run "main = showsPrec 11 42 \"end\""))
"42end")
(hk-test
"showParen + manual composition: build (Just 3)"
(hk-deep-force
(hk-run
"buildJust3 s = showString \"Just \" (shows 3 s)\nmain = showParen True buildJust3 \"\""))
"(Just 3)")
;; ── Read stubs ───────────────────────────────────────────────
(hk-test
"reads: stub returns empty list (null-check)"
(hk-deep-force (hk-run "main = show (null (reads \"42\"))"))
"True")
(hk-test
"readsPrec: stub returns empty list"
(hk-deep-force (hk-run "main = show (null (readsPrec 0 \"True\"))"))
"True")
(hk-test
"reads: type-checks in expression context (length)"
(hk-deep-force (hk-run "main = show (length (reads \"abc\"))"))
"0")
;; ── Direct `show` audit coverage ─────────────────────────────
(hk-test "show Int" (hk-deep-force (hk-run "main = show 42")) "42")
(hk-test
"show negative Int"
(hk-deep-force (hk-run "main = show (negate 5)"))
"-5")
(hk-test "show Bool True" (hk-deep-force (hk-run "main = show True")) "True")
(hk-test
"show Bool False"
(hk-deep-force (hk-run "main = show False"))
"False")
(hk-test
"show String quotes the value"
(hk-deep-force (hk-run "main = show \"hello\""))
"\"hello\"")
(hk-test
"show list of Int"
(hk-deep-force (hk-run "main = show [1,2,3]"))
"[1,2,3]")
(hk-test
"show empty list"
(hk-deep-force (hk-run "main = show (drop 5 [1,2,3])"))
"[]")
(hk-test
"show pair tuple"
(hk-deep-force (hk-run "main = show (1, True)"))
"(1,True)")
(hk-test
"show triple tuple"
(hk-deep-force (hk-run "main = show (1, 2, 3)"))
"(1,2,3)")
(hk-test
"show Maybe Nothing"
(hk-deep-force (hk-run "main = show Nothing"))
"Nothing")
(hk-test
"show Maybe Just"
(hk-deep-force (hk-run "main = show (Just 3)"))
"Just 3")
(hk-test
"show nested Just wraps inner in parens"
(hk-deep-force (hk-run "main = show (Just (Just 3))"))
"Just (Just 3)")
(hk-test
"show Just (negate 3) wraps negative in parens"
(hk-deep-force (hk-run "main = show (Just (negate 3))"))
"Just (-3)")
(hk-test
"show custom nullary ADT"
(hk-deep-force
(hk-run "data Day = Mon | Tue | Wed deriving (Show)\nmain = show Tue"))
"Tue")
(hk-test
"show custom multi-constructor ADT"
(hk-deep-force
(hk-run
"data Shape = Pt | Sq Int | Rect Int Int deriving (Show)\nmain = show (Rect 3 4)"))
"Rect 3 4")
(hk-test
"show list of Maybe wraps each element"
(hk-deep-force (hk-run "main = show [Just 1, Nothing, Just 2]"))
"[Just 1,Nothing,Just 2]")
{:fails hk-test-fails :pass hk-test-pass :fail hk-test-fail}