Mark
2e73a21151
Four RED tests pin D-10 (header pinning) and D-11 (30s trim) contracts:
- 'first chunk is header' — isFirst marker on first addChunk
- 'second chunk is NOT header' — only the first is pinned
- 'trim 30s — keeps header, evicts aged tail' — header survives indefinitely
- 'trim with empty buffer does not throw' — defensive edge case
Plan 03 must export {addChunk, trimAged, getBuffer, resetBuffer} from
src/offscreen/recorder.ts to flip these to GREEN.
Also stages tests/fixtures/.gitkeep so the fixture dir survives clean
checkouts (Plan 07 drops a known-good last_30sec.webm into it after the
manual smoke test).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
41 lines
1.6 KiB
TypeScript
41 lines
1.6 KiB
TypeScript
import { describe, it, expect, beforeEach } from 'vitest';
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import { addChunk, trimAged, getBuffer, resetBuffer } from '../../src/offscreen/recorder';
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describe('ring buffer', () => {
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beforeEach(() => resetBuffer());
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it('first chunk is header', () => {
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addChunk({ size: 1024 } as unknown as Blob, 1_000);
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const buf = getBuffer();
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expect(buf.length).toBe(1);
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expect(buf[0].isFirst).toBe(true);
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});
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it('second chunk is NOT header', () => {
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addChunk({ size: 1024 } as unknown as Blob, 1_000);
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addChunk({ size: 512 } as unknown as Blob, 2_000);
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const buf = getBuffer();
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expect(buf.length).toBe(2);
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expect(buf[0].isFirst).toBe(true);
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expect(buf[1].isFirst).toBeFalsy();
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});
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it('trim 30s — keeps header, evicts aged tail', () => {
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addChunk({ size: 1024 } as unknown as Blob, 0); // header at t=0
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addChunk({ size: 512 } as unknown as Blob, 10_000); // t=10s
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addChunk({ size: 512 } as unknown as Blob, 35_000); // t=35s
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trimAged(40_000); // now=40s
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const buf = getBuffer();
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expect(buf[0].isFirst).toBe(true); // header survives unconditionally
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expect(buf.length).toBeGreaterThanOrEqual(2); // header + at least the t=35s chunk
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// The header chunk's age (40s) does NOT cause it to be trimmed.
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const headerStillThere = buf.some((c) => c.isFirst);
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expect(headerStillThere).toBe(true);
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});
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it('trim with empty buffer does not throw', () => {
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expect(() => trimAged(0)).not.toThrow();
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expect(getBuffer()).toEqual([]);
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});
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});
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