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ebf44f20d3e9983dd338cde4511ee0ba160e9c26
gen1recomp/tests/engine/cart_manifest.lua
T
bryanthaboi ebf44f20d3 Add custom carts: named, version-pinned mod sets that play as their own game 
A custom cart pairs an identity (title, shell colour, label art) with a base
game, a list of mods pinned to exact builds with their option values frozen,
a load order, and a seal. It ships no code of its own: every mod it names is
a separately published mod, which is what keeps a cart auditable before it
runs and reproducible after an author's repo disappears.

Format and storage:
- src/carts/CartManifest.lua parses and validates cart.json, canonicalises it
  for hashing and reads/writes the .g1rcart bundle. The bundle is a data-only
  serialised table read through SaveSerializer, so an imported cart can never
  execute code. Canonical strings are length-prefixed because option keys and
  values are author-controlled and could otherwise forge a record boundary and
  collide two different carts onto one hash.
- Pins name a public source: a GitHub release with its sha256, a GameBanana
  file id with its md5, or "local" for a capture that only exists on this
  install. A local pin is unpublishable by construction, which is what makes
  "build it here, publish later" possible without inventing a hash.
- Label art rides alongside the manifest rather than inside its identity, so
  re-arting a cart does not tell every player their run is out of date.
  src/core/Base64.lua decodes it; strict, with no whitespace tolerance.

Saves:
- Cart playthroughs live in the cart's own slot namespace (saves/cart_<id>/),
  so a cart's file never sits beside a vanilla one and uninstalling a cart
  never orphans a save. Every save records the cart build it was made under.

The seal:
- A sealed cart loads its pinned list, in its order, with its options, and
  nothing else. A pinned mod with no frozen options gets an empty bucket so
  unfrozen keys fall to schema defaults, identical for everyone; otherwise two
  players on one cart quietly run different games.
- A sealed cart refuses to load when a pin is missing or installed at another
  version. Playing a subset of the cart is the exact dishonesty the seal
  exists to prevent, so the refusal loads nothing at all.
- Breaking the seal is permanent, marked per save slot, and downgrades that
  playthrough to open behaviour. It cannot be cleared through any public API.

Launcher:
- A game's page carries a Custom Carts control and a picker; choosing a cart
  turns the page into that cart's page, with its own cartridge, title and save
  slots. The rail of five games never grows and a cart id never reaches
  imp.tab or imp.panelVersion.
- Loader.planCart runs before boot so a refusal is visible on the page instead
  of being discovered as an error after launch.
- Save as cart captures the enabled mods for a game and names, before the
  player confirms, every mod that could only be pinned to this install and
  whether the result can be shared at all.

Authoring:
- tools/cartkit.py scaffolds, validates, pins and packs a cart, and installs a
  release workflow. Its writer is byte-identical to the engine's serialiser.
2026-08-23 12:18:29 -04:00

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package.path = "./?.lua;./?/init.lua;" .. package.path
if not rawget(_G, "bit") and not rawget(_G, "bit32") then
local ok, bit32 = pcall(require, "bit32")
if ok then _G.bit32 = bit32 end
end
local T = require("tests.harness")
local Base64 = require("src.core.Base64")
local CartManifest = require("src.carts.CartManifest")
local SaveSerializer = require("src.core.SaveSerializer")
local SHA = ("a1b2c3d4"):rep(8)
local MD5 = ("0123456789abcdef"):rep(2)
local function baseCart()
return {
id = "kanto_plus",
title = " Kanto Plus ",
version = "1.2.0",
author = "Ren",
repo = "ren/kanto-plus",
summary = "A sealed set of five",
shell = "#3FA9F5",
label = "./art/label.png",
base = "red",
engine = ">=1.4.0",
mods = {
{ id = "rare_soda", source = "github", repo = "ren/rare-soda",
version = "0.4.1", sha256 = SHA,
options = { sweetness = 3, flavour = "grape", fizzy = true } },
{ id = "hard_mode", source = "gamebanana", mod = 4821, file = 99123,
md5 = MD5 },
},
}
end
local function rejects(mutate, fragment, what)
local tbl = baseCart()
mutate(tbl)
local cart, err = CartManifest.parse(tbl)
T.eq(cart, nil, what .. " is rejected")
T.check(type(err) == "string" and err:find(fragment, 1, true) ~= nil,
("%s says why (got %s)"):format(what, tostring(err)))
end
local raw = baseCart()
local cart, err = CartManifest.parse(raw)
T.check(cart ~= nil, "a good manifest parses: " .. tostring(err))
T.eq(cart.title, "Kanto Plus", "title is trimmed")
T.eq(cart.shell, "#3fa9f5", "shell normalises to lowercase")
T.eq(cart.label, "art/label.png", "label normalises through SafePath")
T.eq(cart.seal, "sealed", "seal defaults to sealed")
T.eq(cart.base, "red", "base survives")
T.eq(cart.engine, ">=1.4.0", "engine range is kept unevaluated")
T.eq(#cart.mods, 2, "both pins survive")
T.eq(cart.mods[1].sha256, SHA, "the github pin keeps its sha256")
T.eq(cart.mods[1].repo, "ren/rare-soda", "the github pin keeps its repo")
T.eq(cart.mods[1].version, "0.4.1", "the github pin keeps its version")
T.eq(cart.mods[1].options.flavour, "grape", "frozen option values survive")
T.eq(cart.mods[2].source, "gamebanana", "the gamebanana pin keeps its source")
T.eq(cart.mods[2].mod, 4821, "the gamebanana pin keeps its mod id")
T.eq(cart.mods[2].file, 99123, "the gamebanana pin keeps its file id")
T.eq(cart.mods[2].md5, MD5, "the gamebanana pin keeps its md5")
T.eq(cart.mods[2].sha256, nil, "a gamebanana pin carries no sha256")
T.eq(cart.load_order[1], "rare_soda", "load_order defaults to the mods order")
T.eq(cart.load_order[2], "hard_mode", "load_order defaults to the mods order")
T.eq(raw.title, " Kanto Plus ", "parse does not trim the input in place")
T.eq(raw.shell, "#3FA9F5", "parse does not recolour the input in place")
T.eq(raw.load_order, nil, "parse does not add load_order to the input")
T.neq(cart.mods, raw.mods, "the parsed mods array is a fresh table")
T.neq(cart.mods[1].options, raw.mods[1].options, "options are copied")
local again = CartManifest.parse(baseCart())
T.eq(CartManifest.canonical(again), CartManifest.canonical(cart),
"two independent parses encode identically")
T.eq(CartManifest.hash(again), CartManifest.hash(cart),
"two independent parses hash identically")
T.eq(#CartManifest.hash(cart), 32, "the cart hash is an MD5 hex digest")
local bumped = baseCart()
bumped.mods[1].version = "0.4.2"
T.neq(CartManifest.hash(CartManifest.parse(bumped)), CartManifest.hash(cart),
"a bumped mod version moves the cart hash")
local retuned = baseCart()
retuned.mods[1].options.sweetness = 4
T.neq(CartManifest.hash(CartManifest.parse(retuned)), CartManifest.hash(cart),
"a changed option value moves the cart hash")
local reordered = baseCart()
reordered.load_order = { "hard_mode", "rare_soda" }
local reorderedCart = CartManifest.parse(reordered)
T.eq(reorderedCart.load_order[1], "hard_mode", "an explicit load_order is kept")
T.neq(CartManifest.hash(reorderedCart), CartManifest.hash(cart),
"a different load order moves the cart hash")
local encoded = CartManifest.encode(cart)
local decoded, decodeErr = CartManifest.decode(encoded)
T.check(decoded ~= nil, "an encoded cart decodes: " .. tostring(decodeErr))
T.same(decoded, cart, "the round trip is lossless")
T.eq(CartManifest.hash(decoded), CartManifest.hash(cart),
"the round trip keeps the cart hash")
T.eq(CartManifest.decode(nil), nil, "decode refuses a non-string")
T.eq(CartManifest.decode(""), nil, "decode refuses an empty file")
T.eq(CartManifest.decode("return { }"), nil, "decode refuses an untagged file")
T.eq(CartManifest.decode('return { format = "g1rmodlist" }'), nil,
"decode refuses another format's file")
T.eq(CartManifest.decode(
('return { format = "%s", formatVersion = 99, cart = {} }')
:format(CartManifest.FORMAT)), nil, "decode refuses an unknown schema")
T.eq(CartManifest.decode('return os.exit(1)'), nil,
"decode refuses a file that tries to call out")
T.eq(CartManifest.decode(
('return { format = "%s", formatVersion = 1, cart = { id = "x" } }')
:format(CartManifest.FORMAT)), nil, "decode validates the cart it carries")
rejects(function(c) c.id = nil end, "cart id", "a missing id")
rejects(function(c) c.id = "kanto plus" end, "cart id", "an id with a space")
rejects(function(c) c.id = ("k"):rep(65) end, "cart id", "a 65 character id")
rejects(function(c) c.title = nil end, "cart title", "a missing title")
rejects(function(c) c.title = " " end, "cart title", "a blank title")
rejects(function(c) c.title = ("T"):rep(49) end, "cart title", "a 49 character title")
rejects(function(c) c.version = nil end, "cart version", "a missing version")
rejects(function(c) c.version = "one" end, "cart version", "a non-semver version")
rejects(function(c) c.author = nil end, "cart author", "a missing author")
rejects(function(c) c.author = "" end, "cart author", "an empty author")
rejects(function(c) c.author = ("A"):rep(65) end, "cart author", "a 65 character author")
rejects(function(c) c.repo = "ren" end, "cart repo", "a repo with no owner")
rejects(function(c) c.repo = "ren/kanto/plus" end, "cart repo", "a three part repo")
rejects(function(c) c.summary = ("s"):rep(121) end, "cart summary", "a 121 character summary")
rejects(function(c) c.shell = nil end, "cart shell", "a missing shell colour")
rejects(function(c) c.shell = "3FA9F5" end, "cart shell", "a shell colour with no hash")
rejects(function(c) c.shell = "#3FA9F" end, "cart shell", "a five digit shell colour")
rejects(function(c) c.shell = "#gggggg" end, "cart shell", "a non-hex shell colour")
rejects(function(c) c.label = "../../etc/passwd" end, "cart label", "a climbing label path")
rejects(function(c) c.label = "/etc/passwd" end, "cart label", "an absolute label path")
rejects(function(c) c.label = ("a"):rep(129) end, "cart label", "a 129 character label path")
rejects(function(c) c.base = nil end, "cart base", "a missing base game")
rejects(function(c) c.base = "crystal" end, "cart base", "an unknown base game")
rejects(function(c) c.engine = "" end, "cart engine", "an empty engine range")
rejects(function(c) c.engine = 3 end, "cart engine", "a numeric engine range")
rejects(function(c) c.seal = "welded" end, "cart seal", "an unknown seal")
rejects(function(c) c.mods = nil end, "cart mods", "a cart with no mods array")
rejects(function(c) c.mods = {} end, "cart must pin", "a cart that pins nothing")
rejects(function(c)
for i = 1, 65 do
c.mods[i] = { id = "mod" .. i, source = "gamebanana", mod = i, file = i, md5 = MD5 }
end
end, "cart must pin", "a cart that pins 65 mods")
rejects(function(c) c.mods[1] = "rare_soda" end, "must be a table", "a string mod entry")
rejects(function(c) c.mods[1].id = nil end, "id must be", "a pin with no id")
rejects(function(c) c.mods[1].id = "rare soda" end, "id must be", "a pin id with a space")
rejects(function(c) c.mods[2].id = "rare_soda" end, "pinned twice", "the same mod pinned twice")
rejects(function(c) c.mods[1].source = nil end, "source must be", "a pin with no source")
rejects(function(c) c.mods[1].source = "dropbox" end, "source must be", "a pin from an unknown source")
rejects(function(c) c.mods[1].repo = nil end, "repo must be", "a github pin with no repo")
rejects(function(c) c.mods[1].version = "latest" end, "version must be", "a github pin with no semver")
rejects(function(c) c.mods[1].sha256 = nil end, "sha256", "a github pin with no sha256")
rejects(function(c) c.mods[1].sha256 = SHA:upper() end, "sha256", "an uppercase sha256")
rejects(function(c) c.mods[1].sha256 = SHA:sub(1, 63) end, "sha256", "a short sha256")
rejects(function(c) c.mods[2].mod = nil end, "mod must be", "a gamebanana pin with no mod id")
rejects(function(c) c.mods[2].mod = 0 end, "mod must be", "a gamebanana mod id of zero")
rejects(function(c) c.mods[2].mod = 12.5 end, "mod must be", "a fractional gamebanana mod id")
rejects(function(c) c.mods[2].file = nil end, "file must be", "a gamebanana pin with no file id")
rejects(function(c) c.mods[2].file = -3 end, "file must be", "a negative gamebanana file id")
rejects(function(c) c.mods[2].md5 = nil end, "md5", "a gamebanana pin with no md5")
rejects(function(c) c.mods[2].md5 = MD5:upper() end, "md5", "an uppercase md5")
rejects(function(c) c.mods[2].md5 = MD5 .. "00" end, "md5", "an overlong md5")
rejects(function(c) c.mods[1].options = "grape" end, "options must be a table",
"a non-table options block")
rejects(function(c) c.mods[1].options = { [("k"):rep(65)] = 1 } end,
"option keys", "a 65 character option key")
rejects(function(c) c.mods[1].options = { [1] = "grape" } end,
"option keys", "a numeric option key")
rejects(function(c) c.mods[1].options.nested = { 1, 2 } end,
"must be a string, number or boolean", "a table option value")
rejects(function(c) c.mods[1].options.flavour = ("g"):rep(257) end,
"characters or fewer", "a 257 character option value")
rejects(function(c)
local options = {}
for i = 1, 65 do options["opt" .. i] = i end
c.mods[1].options = options
end, "more than 64 options", "a pin with 65 options")
rejects(function(c) c.load_order = "rare_soda" end, "load_order must be an array",
"a string load_order")
rejects(function(c) c.load_order = { "rare_soda" } end, "exactly once",
"a load_order that drops a mod")
rejects(function(c) c.load_order = { "rare_soda", "hard_mode", "hard_mode" } end,
"exactly once", "a load_order longer than the mods array")
rejects(function(c) c.load_order = { "rare_soda", "rare_soda" } end, "twice",
"a load_order that repeats a mod")
rejects(function(c) c.load_order = { "rare_soda", "master_ball" } end,
"does not pin", "a load_order naming an unpinned mod")
T.eq(CartManifest.parse(nil), nil, "parse refuses a non-table")
local open = baseCart()
open.seal = "open"
open.repo = nil
open.summary = nil
open.label = nil
open.engine = nil
local openCart = CartManifest.parse(open)
T.check(openCart ~= nil, "an open cart with no optional fields parses")
T.eq(openCart.seal, "open", "an open seal survives")
T.eq(openCart.label, nil, "an absent label stays absent")
T.same(CartManifest.decode(CartManifest.encode(openCart)), openCart,
"an open cart round trips")
T.neq(CartManifest.hash(openCart), CartManifest.hash(cart),
"the seal is part of the cart hash")
T.eq(CartManifest.publishable(cart), true,
"a cart pinned entirely to github and gamebanana is publishable")
T.eq(CartManifest.publishable(nil), false, "publishable refuses a non-cart")
T.eq(CartManifest.publishable({}), false, "publishable refuses an unparsed cart")
local localised = baseCart()
localised.mods[1] = { id = "rare_soda", source = "local", version = "0.4.1",
repo = "ren/rare-soda", sha256 = SHA,
options = { flavour = "grape" } }
local localCart, localErr = CartManifest.parse(localised)
T.check(localCart ~= nil, "a local pin parses: " .. tostring(localErr))
T.eq(localCart.mods[1].source, "local", "the local pin keeps its source")
T.eq(localCart.mods[1].version, "0.4.1", "the local pin keeps its version")
T.eq(localCart.mods[1].repo, nil, "a local pin carries no repo")
T.eq(localCart.mods[1].sha256, nil, "a local pin carries no sha256")
T.eq(localCart.mods[1].md5, nil, "a local pin carries no md5")
T.eq(localCart.mods[1].options.flavour, "grape", "a local pin still freezes options")
T.eq(localCart.mods[2].source, "gamebanana", "the sibling pin is untouched")
T.eq(CartManifest.canonical(CartManifest.parse(localised)),
CartManifest.canonical(localCart), "two parses of a local pin encode identically")
T.eq(CartManifest.hash(CartManifest.parse(localised)), CartManifest.hash(localCart),
"two parses of a local pin hash identically")
T.neq(CartManifest.hash(localCart), CartManifest.hash(cart),
"a local pin hashes differently from the github pin it replaced")
local localBump = baseCart()
localBump.mods[1] = { id = "rare_soda", source = "local", version = "0.4.2",
options = { flavour = "grape" } }
T.neq(CartManifest.hash(CartManifest.parse(localBump)), CartManifest.hash(localCart),
"a bumped local pin version moves the cart hash")
T.same(CartManifest.decode(CartManifest.encode(localCart)), localCart,
"a cart holding a local pin round trips")
local publishableLocal, localWhy = CartManifest.publishable(localCart)
T.eq(publishableLocal, false, "a cart holding a local pin is not publishable")
T.check(type(localWhy) == "string" and localWhy:find("rare_soda", 1, true) ~= nil,
"the reason names the local pin (got " .. tostring(localWhy) .. ")")
T.check(localWhy:find("hard_mode", 1, true) == nil,
"the reason leaves the publishable pins out")
local allLocal = baseCart()
allLocal.mods = {
{ id = "rare_soda", source = "local", version = "0.4.1" },
{ id = "hard_mode", source = "local", version = "2.0.0" },
}
local _, allWhy = CartManifest.publishable(CartManifest.parse(allLocal))
T.check(allWhy:find("hard_mode", 1, true) ~= nil and allWhy:find("rare_soda", 1, true) ~= nil,
"the reason names every local pin (got " .. tostring(allWhy) .. ")")
rejects(function(c) c.mods[1] = { id = "rare_soda", source = "local" } end,
"version must be", "a local pin with no version")
rejects(function(c)
c.mods[1] = { id = "rare_soda", source = "local", version = "latest" }
end, "version must be", "a local pin with a non-semver version")
rejects(function(c) c.mods[1].source = "localhost" end, "source must be",
"a source that merely starts like local")
local VECTORS = {
{ "", "" }, { "f", "Zg==" }, { "fo", "Zm8=" }, { "foo", "Zm9v" },
{ "foob", "Zm9vYg==" }, { "fooba", "Zm9vYmE=" }, { "foobar", "Zm9vYmFy" },
{ "\0\255\0", "AP8A" }, { "\255\255\255\255", "/////w==" },
}
for _, row in ipairs(VECTORS) do
T.eq(Base64.encode(row[1]), row[2],
("base64 encodes %q as %s"):format(row[1], row[2]))
T.eq(Base64.decode(row[2]), row[1],
("base64 decodes %s back"):format(row[2] == "" and "an empty string" or row[2]))
end
local seed = 7
local function nextByte()
seed = (seed * 75 + 74) % 65537
return seed % 256
end
for n = 0, 24 do
local chunk = {}
for i = 1, n do chunk[i] = string.char(nextByte()) end
local raw = table.concat(chunk)
local text = Base64.encode(raw)
T.eq(#text % 4, 0, ("base64 pads %d bytes to a multiple of four"):format(n))
T.eq(Base64.decode(text), raw, ("base64 round trips %d random bytes"):format(n))
end
T.eq(Base64.encode(nil), nil, "base64 encode refuses a non-string")
T.eq(Base64.decode(nil), nil, "base64 decode refuses a non-string")
T.eq(Base64.decode("TWF"), nil, "base64 refuses a length that is not a multiple of four")
T.eq(Base64.decode("TW*u"), nil, "base64 refuses a character outside the alphabet")
T.eq(Base64.decode("TWFu\n\n\n\n"), nil, "base64 refuses embedded whitespace")
T.eq(Base64.decode("TW=u"), nil, "base64 refuses padding inside a group")
T.eq(Base64.decode("=WFu"), nil, "base64 refuses a leading pad character")
T.eq(Base64.decode("TWFu===="), nil, "base64 refuses a group that is all padding")
T.eq(Base64.decode("TR=="), nil, "base64 refuses one-byte padding that carries data bits")
T.eq(Base64.decode("Zm9vYmF="), nil, "base64 refuses two-byte padding that carries data bits")
T.eq(Base64.decode("TWFu"), "Man", "base64 decodes a known vector")
local PNG = CartManifest.PNG_SIGNATURE .. "\0\0\0\13IHDRtiny label art"
local ART_DATA = Base64.encode(PNG)
local NONE = {}
local function artTable(over)
local art = { name = "label.png", encoding = "base64", bytes = #PNG,
data = ART_DATA }
for key, value in pairs(over or {}) do
if value == NONE then art[key] = nil else art[key] = value end
end
return art
end
local function bundle(body, art)
return SaveSerializer.encode({ format = CartManifest.FORMAT,
formatVersion = CartManifest.SCHEMA, cart = body, labelArt = art })
end
local arted = CartManifest.parse(baseCart())
arted.labelArt = artTable()
local artedBytes = CartManifest.encode(arted)
local artedRound, artedErr = CartManifest.decode(artedBytes)
T.check(artedRound ~= nil, "a cart with label art decodes: " .. tostring(artedErr))
T.same(artedRound, arted, "the label art survives the encode and decode round trip")
T.eq(artedRound.labelArt.data, ART_DATA, "the base64 payload is preserved verbatim")
T.eq(artedRound.labelArt.bytes, #PNG, "the declared byte count is preserved")
T.eq(artedRound.labelArt.name, "label.png", "the art name is preserved")
T.eq(CartManifest.encode(artedRound), artedBytes,
"re-encoding a decoded cart writes the same bytes")
local artBytes, artName = CartManifest.labelArtBytes(artedRound)
T.eq(artBytes, PNG, "labelArtBytes hands back the PNG that was packed")
T.eq(artName, "label.png", "labelArtBytes hands back the art name")
T.eq(CartManifest.labelArtBytes(cart), nil, "a cart with no art has no art bytes")
T.eq(CartManifest.hash(arted), CartManifest.hash(cart),
"label art is not part of the cart hash")
T.check(CartManifest.canonical(arted):find(ART_DATA, 1, true) == nil,
"the canonical form leaves the art payload out")
local repainted = CartManifest.parse(baseCart())
local REPAINT = PNG .. "repainted"
repainted.labelArt = artTable({ data = Base64.encode(REPAINT), bytes = #REPAINT })
T.eq(CartManifest.hash(repainted), CartManifest.hash(arted),
"changing only the art leaves the cart hash alone")
T.eq(CartManifest.labelArtBytes(CartManifest.decode(CartManifest.encode(repainted))),
REPAINT, "the repainted art round trips")
local plain = CartManifest.decode(CartManifest.encode(cart))
T.eq(plain.labelArt, nil, "a cart with no art still decodes without art")
T.check(CartManifest.encode(cart):find("labelArt", 1, true) == nil,
"a cart with no art writes no labelArt key")
T.same(plain, cart, "a cart with no art round trips exactly as before")
local OVERSIZE = PNG .. string.rep("\0", CartManifest.MAX_LABEL_ART)
local OVERSIZE_DATA = Base64.encode(OVERSIZE)
local function drops(art, what)
local decodedArt, dropErr = CartManifest.decode(bundle(cart, art))
T.check(decodedArt ~= nil, what .. " still loads the cart: " .. tostring(dropErr))
T.eq(decodedArt.labelArt, nil, what .. " drops the art")
T.same(decodedArt, cart, what .. " leaves the rest of the cart untouched")
end
drops("label.png", "art that is not a table")
drops(artTable({ encoding = "hex" }), "art in an encoding we do not support")
drops(artTable({ encoding = NONE }), "art with no encoding")
drops(artTable({ data = "not base64!!" }), "art whose payload is not base64")
drops(artTable({ data = NONE }), "art with no payload")
drops(artTable({ data = "" }), "art with an empty payload")
drops(artTable({ bytes = #PNG + 1 }), "art whose byte count is too high")
drops(artTable({ bytes = #PNG - 1 }), "art whose byte count is too low")
drops(artTable({ bytes = NONE }), "art with no byte count")
drops(artTable({ bytes = tostring(#PNG) }), "art whose byte count is a string")
drops(artTable({ data = Base64.encode("GIF89a not a png at all"),
bytes = #"GIF89a not a png at all" }), "art that is not a PNG")
drops(artTable({ data = OVERSIZE_DATA, bytes = #OVERSIZE }), "art past the size cap")
drops(artTable({ name = "../../etc/passwd" }), "art whose name climbs out")
drops(artTable({ name = ("a"):rep(129) }), "art with a 129 character name")
drops(artTable({ name = 7 }), "art with a numeric name")
local unnamed = CartManifest.decode(bundle(cart, artTable({ name = NONE })))
T.check(unnamed ~= nil and unnamed.labelArt ~= nil, "art with no name is still kept")
T.eq(unnamed.labelArt.name, nil, "the missing art name stays missing")
T.eq(CartManifest.labelArtBytes(unnamed), PNG, "unnamed art still decodes")
T.eq(CartManifest.parseLabelArt(nil), nil, "parseLabelArt refuses an absent payload")
local _, capErr = CartManifest.parseLabelArt(
artTable({ data = OVERSIZE_DATA, bytes = #OVERSIZE }))
T.check(type(capErr) == "string" and capErr:find("bytes or fewer", 1, true) ~= nil,
"the size cap says why (got " .. tostring(capErr) .. ")")
local _, pngErr = CartManifest.parseLabelArt(
artTable({ data = Base64.encode("nope"), bytes = 4 }))
T.check(type(pngErr) == "string" and pngErr:find("PNG", 1, true) ~= nil,
"a non-PNG payload says why (got " .. tostring(pngErr) .. ")")
T.finish("cart_manifest")
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