How to test production for dummies

09/30/2025

Step-by-step guide to testing in production

Use feature flags:
Enable new features for a small group of users or internal testers by "turning on" a feature flag. This lets you test the feature in the real production environment without affecting most users.
Roll out gradually:
Deploy changes in small increments. This makes it easier to isolate the cause of an issue if one arises. For example, a new version is released to a small percentage of users first, then to a larger percentage, and so on.
Employ A/B testing:
Use A/B testing to compare two versions of a feature. This is useful for testing user experience changes and determining which version is more effective.
Monitor performance and errors:
Have robust monitoring and alerting set up to quickly identify any issues. Set up alerts to notify you immediately if errors, performance degradations, or other problems occur.
Prepare for quick rollback:
Always have an easy way to revert a change if it causes problems. This could be an automatic rollback feature or a fast deployment process that allows you to quickly go back to the previous stable version.
Consider dark launching:
Deploy a feature to production but keep it hidden from users. You can then send a duplicate or "shadow" copy of production traffic to the new code to test its performance and correctness without impacting live users.

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