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Chinesezjc
538ad4d3dc
The package README (both languages) still described this layer as protocol-only with the PythonCodeRuntime implementation deferred to a later PR, contradicting the shipped code. Rewrite the intro to describe the registered runtime, add a Configuration section for every Config cap, and drop the "implementation not in this layer" limitation. Also pin the residual-detach fixture's size invariant: the byteLength assertion only holds above Node's Buffer pool threshold.
39 lines
2.0 KiB
TypeScript
39 lines
2.0 KiB
TypeScript
import { describe, expect, it } from 'vitest'
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import { detachResidual } from '../src/index.ts'
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describe('detachResidual — fd-3 residual detachment', () => {
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it('returns a copy that does NOT share the source frame allocation', () => {
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// Simulate the data handler's state: one large joined frame from
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// Buffer.concat, sliced past its newline to leave a small residual VIEW.
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// The fixture MUST stay larger than Node's Buffer pool threshold
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// (`Buffer.poolSize / 2`, 4 KiB): above it `Buffer.from` allocates a
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// dedicated backing store whose `byteLength` equals the copy's length,
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// which is what the byteLength assertion below pins. A smaller residual
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// would be pooled into an 8 KiB shared ArrayBuffer, making `byteLength`
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// report 8192 and the assertion false-fail even though the fix is intact.
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const joined = Buffer.alloc(1024 * 1024, 0x61) // 1 MiB backing allocation
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joined[512] = 0x0a // a newline partway through
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const residual = joined.subarray(513) // a view onto `joined`'s backing store
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// Before the fix the handler carried this view forward verbatim, pinning the
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// whole 1 MiB `joined` allocation behind a residual that reports far fewer
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// bytes. A right-sized copy must not point back into `joined`.
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const [carried] = detachResidual(residual)
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expect(carried).toBeDefined()
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expect(carried!.length).toBe(residual.length)
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expect(carried!.equals(residual)).toBe(true)
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// The core invariant: the copy does NOT share the source frame's backing
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// store, so retaining it cannot pin the 1 MiB allocation.
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expect(carried!.buffer).not.toBe(joined.buffer)
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// And the copy's own backing store is sized to its content — not the whole
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// frame. Holds because the fixture exceeds the pool threshold (see above);
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// a subarray view would report the source's full byteLength here.
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expect(carried!.buffer.byteLength).toBe(carried!.length)
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})
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it('carries nothing forward for an empty residual', () => {
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expect(detachResidual(Buffer.alloc(0))).toEqual([])
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})
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})
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