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test(code-runtime-python): cover the sub-2-byte guard of the exact-cost walk

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The new jsonStringCostUpTo guard (returns undefined below a 2-byte cap) was
uncovered: forged open frames drive the host ledger down to one byte, and a new
open entry's first-fragment cap (logBudget - 1 = 0) trips the guard and
truncates to the marker, asserted as the merged entry plus the marker.
This commit is contained in:
Chinesezjc
2026-08-31 15:03:21 +08:00
committed by Tianyi Cui
parent 3001cc23be
commit 22e2dc454d
1 changed files with 19 additions and 0 deletions
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packages/code-runtime/code-runtime-python/tests/runtime.spec.ts
+19
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@@ -1992,6 +1992,25 @@ describe('PythonCodeRuntime — programs and bindings', () => {
expect(result.logs).toEqual(['a'.repeat(30) + 'b'.repeat(30)])
}, 15_000)
it('rejects a new open entry once the ledger has only two bytes left', async () => {
// The jsonStringCostUpTo sub-2-byte guard: forged open frames drive the
// host ledger down to 1 byte, then a new open entry's first-fragment cap
// (logBudget - 1 = 0) trips the guard and truncates.
const { runtime } = await setup({ maxLogBytes: 64 })
const result = await runtime.run({
program: [
'import os',
"os.write(3, ('{\"type\":\"log\",\"text\":\"' + 'a' * 28 + '\",\"open\":true}\\n').encode())",
"os.write(3, ('{\"type\":\"log\",\"text\":\"' + 'a' * 31 + '\"}\\n').encode())",
"os.write(3, b'{\"type\":\"log\",\"text\":\"x\",\"open\":true}\\n')",
'return "done"',
].join('\n'),
bindings: [],
})
expect(result.error).toBeUndefined()
expect(result.logs).toEqual(['a'.repeat(59), logTruncationMarker(64)])
}, 15_000)
it('truncates when the closing frame of a merged entry overflows the budget', async () => {
// The merged entry's billed-once cost: an open fragment that nearly
// exhausts the budget, then a closing frame whose content no longer fits —