# Testing signals — koajs/koa

> Canonical page: https://codevetter.com/unpack/koa/testing-signals

# Testing signals — koajs/koa

Scanned commit 824c1cf8de9a91a2941973b25dc8a3d3029b9e4f (2026-09-18). Generated by codevetter codevetter 1.15.0 on 2026-10-02.

Source inspection; upstream code and tests were not executed.

Tests and CI were inspected, not executed; test existence is not a passing result. The inspected suites combine Node's test runner, strict assertions, Supertest requests, and synthetic HTTP wrappers. This is a bounded inventory, with explicit limits around mocked integrations and the declared CI matrix.
- The test script uses node --test and coverage uses c8 with lcov/text-summary; application suites import node:test, Supertest, and node:assert/strict rather than relying on the test config's Jest label. — [package.json#L17-22](https://github.com/koajs/koa/blob/824c1cf8de9a91a2941973b25dc8a3d3029b9e4f/package.json#L17-L22) [__tests__/application/compose.test.js#L3-6](https://github.com/koajs/koa/blob/824c1cf8de9a91a2941973b25dc8a3d3029b9e4f/__tests__/application/compose.test.js#L3-L6) [__tests__/.eslintrc.yml#L1-3](https://github.com/koajs/koa/blob/824c1cf8de9a91a2941973b25dc8a3d3029b9e4f/__tests__/.eslintrc.yml#L1-L3)
- Application composition tests assert downstream/upstream order and a configurable composer; currentContext tests check concurrent requests, timer/immediate boundaries, disabled mode, and error-event context. — [__tests__/application/compose.test.js#L9-65](https://github.com/koajs/koa/blob/824c1cf8de9a91a2941973b25dc8a3d3029b9e4f/__tests__/application/compose.test.js#L9-L65) [__tests__/application/currentContext.test.js#L11-79](https://github.com/koajs/koa/blob/824c1cf8de9a91a2941973b25dc8a3d3029b9e4f/__tests__/application/currentContext.test.js#L11-L79)
- Response integration tests assert HEAD suppression with preserved JSON/string/buffer lengths, Blob length, ReadableStream chunks, and Response status/header/body forwarding. — [__tests__/application/respond.test.js#L95-125](https://github.com/koajs/koa/blob/824c1cf8de9a91a2941973b25dc8a3d3029b9e4f/__tests__/application/respond.test.js#L95-L125) [__tests__/application/respond.test.js#L531-593](https://github.com/koajs/koa/blob/824c1cf8de9a91a2941973b25dc8a3d3029b9e4f/__tests__/application/respond.test.js#L531-L593) [__tests__/application/respond.test.js#L618-659](https://github.com/koajs/koa/blob/824c1cf8de9a91a2941973b25dc8a3d3029b9e4f/__tests__/application/respond.test.js#L618-L659)
- Response-body unit tests exercise custom stream detection, deferred pipeline error ownership, stream-to-stream preservation, stream-to-null destruction, and errors from a replaced stream. — [__tests__/response/body.test.js#L107-170](https://github.com/koajs/koa/blob/824c1cf8de9a91a2941973b25dc8a3d3029b9e4f/__tests__/response/body.test.js#L107-L170) [test-helpers/stream.js#L5-19](https://github.com/koajs/koa/blob/824c1cf8de9a91a2941973b25dc8a3d3029b9e4f/test-helpers/stream.js#L5-L19)
- Cookie and error suites assert missing signing-key errors, .sig output, proxy-derived secure cookies, outgoing-header clearing, err.headers replacement, and errors after headers were flushed. — [__tests__/context/cookies.test.js#L26-86](https://github.com/koajs/koa/blob/824c1cf8de9a91a2941973b25dc8a3d3029b9e4f/__tests__/context/cookies.test.js#L26-L86) [__tests__/context/onerror.test.js#L26-95](https://github.com/koajs/koa/blob/824c1cf8de9a91a2941973b25dc8a3d3029b9e4f/__tests__/context/onerror.test.js#L26-L95)
- Query tests cover repeated keys and unsupported nested-object serialization; back tests cover external and scheme-relative referrers; ESM tests compare default identity and exported property names. — [__tests__/lib/search-params.test.js#L7-38](https://github.com/koajs/koa/blob/824c1cf8de9a91a2941973b25dc8a3d3029b9e4f/__tests__/lib/search-params.test.js#L7-L38) [__tests__/response/back.test.js#L23-28](https://github.com/koajs/koa/blob/824c1cf8de9a91a2941973b25dc8a3d3029b9e4f/__tests__/response/back.test.js#L23-L28) [__tests__/response/back.test.js#L56-63](https://github.com/koajs/koa/blob/824c1cf8de9a91a2941973b25dc8a3d3029b9e4f/__tests__/response/back.test.js#L56-L63) [__tests__/load-with-esm.test.js#L4-35](https://github.com/koajs/koa/blob/824c1cf8de9a91a2941973b25dc8a3d3029b9e4f/__tests__/load-with-esm.test.js#L4-L35)
- Integration limits are visible: snapshot tests replace v8.startupSnapshot, HTTP/2 host tests use synthetic request fields, and tests labeled 'from fetch()' locally construct Response objects rather than performing fetch. — [__tests__/application/currentContext.test.js#L129-145](https://github.com/koajs/koa/blob/824c1cf8de9a91a2941973b25dc8a3d3029b9e4f/__tests__/application/currentContext.test.js#L129-L145) [__tests__/request/host.test.js#L33-50](https://github.com/koajs/koa/blob/824c1cf8de9a91a2941973b25dc8a3d3029b9e4f/__tests__/request/host.test.js#L33-L50) [test-helpers/context.js#L6-15](https://github.com/koajs/koa/blob/824c1cf8de9a91a2941973b25dc8a3d3029b9e4f/test-helpers/context.js#L6-L15) [__tests__/application/respond.test.js#L662-675](https://github.com/koajs/koa/blob/824c1cf8de9a91a2941973b25dc8a3d3029b9e4f/__tests__/application/respond.test.js#L662-L675)
- CI declares npm ci, lint, coverage, and Codecov on Node 22/24/26; Node 18/20 are outside this matrix despite the >=18 engine range, and the publish workflow has no explicit lint/test step. — [.github/workflows/node.js.yml#L14-30](https://github.com/koajs/koa/blob/824c1cf8de9a91a2941973b25dc8a3d3029b9e4f/.github/workflows/node.js.yml#L14-L30) [package.json#L65-66](https://github.com/koajs/koa/blob/824c1cf8de9a91a2941973b25dc8a3d3029b9e4f/package.json#L65-L66) [.github/workflows/npm-publish.yml#L41-50](https://github.com/koajs/koa/blob/824c1cf8de9a91a2941973b25dc8a3d3029b9e4f/.github/workflows/npm-publish.yml#L41-L50)

Every claim links to its cited files at the pinned commit. Citations identify source evidence; they do not establish runtime correctness. Independent CodeVetter scan — not reviewed by upstream maintainers.

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