New integration tests for @sentry/node #4260

Let's figure out how to best test @sentry/node.

• Run an express server and check stuff?
• Something similar to nextjs server tests https://github.com/getsentry/sentry-javascript/blob/master/packages/nextjs/test/integration/test/server.js?

Our existing setup (running node scripts and asserting on the process): https://github.com/getsentry/sentry-javascript/tree/master/packages/node/test/manual

@onurtemizkan fyi if you have any feedback.

List of things that need to be tested:

Public API tests

• addBreadcrumb
• captureException
• captureMessage
• configureScope
• setContext
• setExtra
• setExtras
• setTag
• setTags
• setUser
• withScope
• showReportDialog
• flush

Performance

• startTransaction
• Node Database Auto-instrumentation
  • Mongo
  • MySQL
  • Postgres

Sessions

Express

• Errors
• Performance

Koa

• Errors
• Performance