Integration Testing: A Complete Guide for Data Practitioners

Introduction

Your data pipeline just failed at 4 AM. The culprit? A small change to a SQL filtering condition that corrupted data across every downstream system, breaking dashboards company-wide. This scenario plays out more often than you'd think, and it highlights why integration testing matters for anyone working with data.

Integration testing examines how different software modules work together as a group, evaluating whether they interact correctly according to specified requirements. While unit tests confirm individual components function properly in isolation, integration testing reveals whether those components collaborate effectively when combined.