Testing: Do More With Less (AdvancedJS 2024)
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The document discusses a practical approach to testing Node.js web applications and APIs, focusing on improving deployment confidence and performance through effective testing strategies. It introduces DORA metrics to measure aspects like deployment frequency and change failure rate, and advocates for a 'testing trophy' methodology involving unit, integration, and end-to-end tests. Key takeaways include prioritizing integration tests, minimizing end-to-end tests, and utilizing various tools to enhance testing efficiency.
Testing: Do More With Less (AdvancedJS 2024)
- 1. Testing: Do More With Less Practical approach to test Node.js web-apps, APIs, BFFs Eugene Fidelin AdvancedJS Amsterdam, 7 Feb 2024
- 2. 2 Is your code well-tested? Do you feel comfortable deploying it automatically to production on a Friday evening? Does your release pipeline stay as green as an evergreen tree?
- 3. Why? DORA metrics Lead Time for Changes The amount of time it takes a commit to get into production Change Failure Rate The percentage of deployments causing a failure in production 3 Deployment Frequency How often a team successfully releases to production Time to restore service How long it takes a team to recover from a failure in production
- 4. Static Unit tests Integration tests End to end tests Price Confidence Speed Very high High Low Low - Medium Very good High Low Average High Extra low Low Very high 4 How? Testing trophy
- 5. Steps to approach testing 0 2 4 1 Step 0 Enable static linters Step 2 Write unit tests for reusable parts and code without coverage Step 4 Use metrics to identify anomalies on production 3 Step 3 Write very few e2e tests only for the most business critical flow(s) Step 1 Create integration tests for all happy and non-happy flows
- 6. Unit tests 6 App code Code to test External lib/service Test coverage Mocks
- 7. Integration tests I 7 App code Code to test External lib/service Test coverage Mocks
- 8. Integration tests II 8 App code Code to test External lib/service Test coverage Mocks
- 9. Integration tests III 9 App code Code to test External lib/service Test coverage Mocks
- 10. End to end tests 10 App code Code to test External lib/service Test coverage Mocks
- 11. Key takeaways 11 Adopt Testing Trophy 01 Start with Integration tests 02 Reduce amount of e2e test 03 Measure impact with DORA metrics 04
- 12. Tools node-mocks-http Mock Express.js request/response objects superagent Simulate incoming request Jest Test framework, mock deps, snapshots nock Mock downstream API calls 12 Cypress.io Testing in browser
- 13. CREDITS: This presentation template was created by Slidesgo, including icons by Flaticon and infographics & images by Freepik Thanks! 13 Eugene Fidelin Engineering Manager @ eugene.fi[email protected] linkedin.com/in/eugef medium.com/@EugeneFidelin