Test what your app reports to Sentry — without sending anything to Sentry's servers.

When building tests for your application you want to assert that the right flow-tracking or error is being sent to Sentry, but without really sending it and swamping your Sentry project with false reports from test runs and CI.

Sentry Testkit — to the rescue

Sentry Testkit enables Sentry to work natively in your application while running tests: reports are intercepted and logged into memory instead of being sent over the wire. Your tests can then fetch and assert on everything that was (or wasn't) captured:

• Errors and messages — captureException, captureMessage, breadcrumbs, tags, extra, user
• Performance transactions and spans — names, ops, attributes, span trees
• Structured logs — everything sent via Sentry.logger.*
• Feature flags — which flags were evaluated when an error was captured
• Async-safe assertions — built-in waitFor* helpers, no sleeps and no flaky tests

Installation

npm:

npm install sentry-testkit --save-dev

yarn:

yarn add sentry-testkit --dev

Requires Sentry JavaScript SDK v9 or v10. Using Sentry v8? Stay on sentry-testkit@6 or see the v7 migration guide.

Usage

// some.spec.js
const sentryTestkit = require('sentry-testkit')

const { testkit, sentryTransport } = sentryTestkit()

// initialize your Sentry instance with sentryTransport
Sentry.init({
    dsn: 'some_dummy_dsn',
    transport: sentryTransport,
    enableLogs: true, // if you want to test Sentry.logger.* calls
    //... other configurations
})

test('collects error events', async function () {
  // run any scenario that eventually calls Sentry.captureException(...)
  const reports = await testkit.waitForReports(1)
  expect(reports[0].error.message).toEqual('something went wrong')
})

test('collects performance events', async function () {
  // run any scenario that eventually starts and ends a span
  await testkit.waitForTransactions(1)
  expect(testkit.findTransaction('checkout-flow')).toBeDefined()
})

test('collects structured logs', async function () {
  Sentry.logger.info('user logged in', { userId: 42 })
  await Sentry.flush()
  expect(testkit.logs()[0].attributes.userId).toEqual(42)
})

More querying power when you need it:

testkit.findReportByMessage(/user \d+/)
testkit.reportsWithTag('section', 'billing')
testkit.transactionsWithTag('flow', 'signup')
testkit.reports()[0].flags // [{ flag: 'new-checkout', result: true }]
testkit.reset()            // clean state between tests

Integration modes

The custom transport shown above is the most common setup, but the testkit can intercept Sentry traffic in whichever way fits your test environment:

Mode	Use case
Transport (sentryTransport)	Unit/integration tests — replaces Sentry's HTTP sender
Browser entry (sentry-testkit/browser)	Same as transport, without any Node.js dependencies
Local server (localServer)	A real local endpoint that mimics Sentry's API and generates a local DSN
Puppeteer (testkit.puppeteer)	E2E tests — captures the page's Sentry requests
Network interception (initNetworkInterceptor)	Bring your own interceptor (nock, MSW, ...)
Jest mock (sentry-testkit/dist/jestMock)	Auto-injects the testkit as global.testkit

Running in browser

sentry-testkit relies on express and http packages from NodeJS. We have a separate entry sentry-testkit/browser which does not include any NodeJS-related code:

const sentryTestkit = require('sentry-testkit/browser')

const { testkit } = sentryTestkit()
// Your code for browser

Testkit API

See the full API description and documentation here: https://zivl.github.io/sentry-testkit/

Roadmap

sentry-testkit is expanding to cover the full modern Sentry SDK surface — user feedback, cron check-ins, sessions, session replay, attachments, metrics, and more. Follow (or help shape) the plan in the tracking issue.

Raven-Testkit

The good old legacy raven-testkit documentation can be found here. It is still there to serve Raven, which is the old legacy SDK of Sentry for JavaScript/Node.js platforms.

Change Log

We're constantly and automatically updating our CHANGELOG file, so it's always a good spot to check out what we have been up to...

Contribution

We'd love any kind of contribution to get better, improve our capabilities, fix bugs, and bring more features as Sentry expands their tools as well. Please check our CONTRIBUTING guidelines for more info and how to get started.

License

Sentry Testkit is MIT licensed.