Use synthetic version fixtures in the gate-guard test (not the repo's real pins)

Author: dmerand

bin/check-ci-gates.test.js

@@ -3,12 +3,14 @@ import test from 'node:test'
 
 import {findProblems, parseJobIds} from './check-ci-gates.js'
 
-const workflow = (jobIds, {node = '26.1.0', pnpm = '10.11.1'} = {}) =>
+// Versions below are arbitrary fixtures, not the repo's real pins — the guard
+// reads those from dev.yml / tests-pr.yml at runtime, never hard-coded.
+const workflow = (jobIds, {node = '1.2.3', pnpm = '4.5.6'} = {}) =>
   `name: tests\non: pull_request\nenv:\n  DEFAULT_NODE_VERSION: '${node}'\n  PNPM_VERSION: '${pnpm}'\njobs:\n` +
   jobIds.map((id) => `  ${id}:\n    runs-on: ubuntu-latest\n    steps: []`).join('\n') +
   '\n'
 
-const devYml = ({node = '26.1.0', pnpm = '10.11.1'} = {}) =>
+const devYml = ({node = '1.2.3', pnpm = '4.5.6'} = {}) =>
   `name: cli\nup:\n  - node:\n      version: ${node}\n      package_manager: pnpm@${pnpm}\n  - packages:\n      - jq\n`
 
 test('in sync: no problems', () => {
@@ -27,7 +29,7 @@ test('manifest lists a job absent from the workflow', () => {
 })
 
 test('node version mismatch is detected', () => {
-  const {problems} = findProblems({workflow: workflow(['a'], {node: '25.0.0'}), devYml: devYml({node: '26.1.0'}), manifestJobIds: ['a']})
+  const {problems} = findProblems({workflow: workflow(['a'], {node: '9.9.9'}), devYml: devYml({node: '1.2.3'}), manifestJobIds: ['a']})
   assert.match(problems.join('\n'), /Node version mismatch/)
 })
 
@@ -45,7 +47,7 @@ test('a missing version pin is reported, not silently passed', () => {
 // Hardening: tolerate a trailing comment after the job id, and ignore deeper-indented
 // keys, blank lines, comment lines, and any top-level section after `jobs:`.
 test('parseJobIds tolerates comments and ignores non-job lines', () => {
-  const wf = `env:\n  DEFAULT_NODE_VERSION: '26.1.0'\njobs:\n  build: # freshness gate\n    runs-on: ubuntu-latest\n    env:\n      NESTED: 1\n\n  # a comment line\n  test-job:\n    steps: []\nconcurrency:\n  group: x\n`
+  const wf = `env:\n  DEFAULT_NODE_VERSION: '1.2.3'\njobs:\n  build: # freshness gate\n    runs-on: ubuntu-latest\n    env:\n      NESTED: 1\n\n  # a comment line\n  test-job:\n    steps: []\nconcurrency:\n  group: x\n`
   assert.deepEqual(parseJobIds(wf), ['build', 'test-job'])
 })