Fix Windows PowerShell compatibility in reference server tests

[Copilot]

The test-reference-server.yml workflow was failing on Windows with the error:

SERVER_PID=$!: The term 'SERVER_PID=$!' is not recognized as a name of a cmdlet

This occurred because the workflow used bash-specific syntax (SERVER_PID=$!, kill $SERVER_PID) in the "Start server (smoke test)" step, which doesn't work in PowerShell on Windows runners.

Solution

Replaced the bash-specific inline server lifecycle management with the existing cross-platform Node.js tests that properly handle server startup and shutdown using child_process.spawn().

Key Changes

1. Removed bash-specific workflow step: Eliminated 20 lines of bash code that used npm start &, SERVER_PID=$!, and kill $SERVER_PID

2. Enhanced existing npm test: Modified the "Test reference server" step to run without continue-on-error, making it the primary test mechanism

3. Fixed Node.js test file: Updated reference-server/test/server.test.js to:

   • Use CommonJS syntax to match TypeScript output format
   • Correct health endpoint assertions to match actual API response (status and timestamp fields)
   • Fix npm test glob pattern from test/**/*.test.js to test/*.test.js

Before vs After

Before (bash-specific):

run: |
  npm start &
  SERVER_PID=$!
  sleep 10
  curl -f http://localhost:3000/health || exit 1
  kill $SERVER_PID

After (cross-platform):

run: npm test

The Node.js test properly manages server lifecycle using spawn('npm', ['start']) and server.kill('SIGTERM'), which works consistently across all platforms.

Testing

Verified the complete workflow sequence passes on Linux:

• ✅ Install dependencies
• ✅ Lint reference server
• ✅ Build reference server
• ✅ Test reference server (health + OpenAPI endpoints)

This solution follows the repository's "script-first approach" philosophy where workflows call scripts that can be run locally, enabling easier debugging and development.

Fixes #5.

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