🐛 Problem

The test helper HTTP servers don't handle errors from server.listen(), causing confusing crashes when the port is already in use or there's a network binding issue.

Affected Files

• packages/w3up-client/test/helpers/bucket-server.js
• packages/w3up-client/test/helpers/receipts-server.js
• packages/w3up-client/test/helpers/gateway-server.js
• packages/upload-client/test/helpers/bucket-server.js
• packages/upload-client/test/helpers/receipts-server.js

Current Behavior

When a test server fails to start (e.g., port already in use), the process crashes with an unhandled error event:

throw er; // Unhandled 'error' event
^

Error: listen EADDRINUSE: address already in use :::9999
at Server.setupListenHandle [as _listen2] (node:net:1908:16)
at listenInCluster (node:net:1965:12)
at Server.listen (node:net:2067:7)
[... 10+ more lines of stack trace ...]

🔄 Steps to Reproduce

pnpm nx build @storacha/upload-client


cd packages/upload-client/test/helpers
PORT=9999 node [receipts-server.js](http://_vscodecontentref_/1)


PORT=9999 node [receipts-server.js](http://_vscodecontentref_/2)
# => Crashes with unhandled error event

Failed to start server on port 9999: listen EADDRINUSE: address already in use :::9999