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cultmesh-browser test: make the unallocatable-size refusal certain on hosts that overcommit #93

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libby merged 1 commit from libby/browser-too-large-test-deterministic into main 2026-11-11 07:35:34 +00:00
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1 changed files with 8 additions and 2 deletions
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packages/cultmesh-browser/test/content.test.ts
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@ -567,8 +567,14 @@ test("a size the runtime cannot allocate is too-large in both exports, not a Ran
const count = 2 ** 15;
const huge = { ...manifest, sizeBytes: count * int32Max, chunks: Array.from({ length: count }, (_, index) => ({ ...manifest.chunks[0]!, offset: index * int32Max, sizeBytes: int32Max })) };
const server = double(() => { throw new Error("no request expected"); });
await assert.rejects(fetchVerifiedContent(ENDPOINT, huge, { fetch: server.fetch, maxBytes: size }), codeOf("too-large"));
await assert.rejects(fetchVerifiedChunk(ENDPOINT, manifest.chunks[0]!.chunkHash!, size, { fetch: server.fetch, maxBytes: size }), codeOf("too-large"));
// a host with overcommit hands out 64 TiB lazily, so the refusal is made certain: the runtime cannot allocate it
const native = globalThis.Uint8Array;
const refusing = new Proxy(native, { construct: (target, args, receiver) => { if (typeof args[0] === "number" && args[0] > 2 ** 40) throw new RangeError("Array buffer allocation failed"); return Reflect.construct(target, args, receiver); } });
globalThis.Uint8Array = refusing;
try {
await assert.rejects(fetchVerifiedContent(ENDPOINT, huge, { fetch: server.fetch, maxBytes: size }), codeOf("too-large"));
await assert.rejects(fetchVerifiedChunk(ENDPOINT, manifest.chunks[0]!.chunkHash!, size, { fetch: server.fetch, maxBytes: size }), codeOf("too-large"));
} finally { globalThis.Uint8Array = native; }
assert.equal(server.calls.length, 0);
});