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test(mcp): assert documented bucket boundaries land in the Prom scrape

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The existing bucket tests pinned the exported JS constants; the views[]
wiring in MeterProvider could be deleted and they would still pass. This
test boots a real exporter, makes one observation, and asserts every
documented boundary appears as an le= label on the bucket lines.
This commit is contained in:
Nathan Hangen 2026-05-10 21:34:15 -04:00
parent 6b37e6e228
commit f13bd3c4c6
1 changed files with 24 additions and 0 deletions
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24
gitnexus/test/unit/mcp/metrics.test.ts
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@ -256,4 +256,28 @@ describe('bucket boundary contract', () => {
it('publishes the documented result-size buckets verbatim', () => {
expect(RESULT_BYTES_BUCKETS).toEqual([512, 2048, 8192, 32768, 131072, 524288, 2097152]);
});
it('exposes the documented bucket boundaries in the Prometheus scrape', async () => {
process.env['GITNEXUS_OTEL_METRICS'] = 'on';
await withRandomPort(async () => {
const init = await initMetrics();
await observe(
'context',
async () => ({ content: [{ type: 'text', text: 'x' }] }),
(r) => Buffer.byteLength(r.content[0]!.text, 'utf8'),
() => false,
);
const text = await fetch(`http://127.0.0.1:${init.port}/metrics`).then((r) => r.text());
for (const b of DURATION_BUCKETS_SECONDS) {
expect(text).toMatch(
new RegExp(`gitnexus_mcp_tool_request_duration_seconds_bucket\\{[^}]*le="${b}"\\}`),
);
}
for (const b of RESULT_BYTES_BUCKETS) {
expect(text).toMatch(
new RegExp(`gitnexus_mcp_tool_result_bytes_bucket\\{[^}]*le="${b}"\\}`),
);
}
});
});
});