The first build should survive contact with reality.

Integration testing for an MVP is not optional. It’s the line between a prototype that collapses under live conditions and a product that earns trust. Unit tests catch internal logic failures, but they tell you nothing about how components behave together. Integration testing exposes broken contracts, faulty data flows, and real-world edge cases before users do.

An MVP is lean, but lean does not mean fragile. To move fast without breaking everything, you need a test suite that runs through core flows: API calls, database writes, external service integrations, and authentication. These flows are the skeleton of the product. If one fails, the rest is noise.

Set scope first. Test only the most critical paths needed for launch. Build tests that replicate production configurations, not lab conditions. Simulate the timing, latency, and load your system will face. The goal is to prove the MVP can survive basic operational stress.

Automate these tests. CI/CD pipelines should trigger integration checks on every merge. Keep logs tight and actionable, with failures pointing directly to root causes. This shortens your feedback loop and cuts deployment risk.

Track coverage not by lines of code but by percentage of mission-critical flows tested end-to-end. A single untested integration point can break the MVP in production.

Integration testing is the shield for your launch day. Without it, you ship blind. With it, you gain confidence to push updates, onboard users, and explore scale.

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