What Is Integration Testing in Manual Testing?

Integration testing in manual testing checks whether different modules or components of an application work well together once combined. It helps catch issues that may not show up when testing modules in isolation.

• Validates module interaction: It focuses on how components communicate ensuring data flows correctly and interfaces respond as expected when modules are integrated.
• Finds interface defects early: Manual integration testing helps spot issues like incorrect data exchange, broken API calls, or misaligned logic that surface only during interaction between modules.
• Bridges the gap between unit and system testing: It comes after unit testing and before system testing, giving teams confidence that the application is ready for full-scale testing.
• Supports different integration strategies: Common approaches include top-down, bottom-up, and big bang integration. Each method has its own use case, but the goal remains the same: make sure combined modules work reliably.
• Improves test coverage and software quality: By manually verifying integrated components, teams can prevent late-stage bugs, reduce rework, and ensure smoother overall performance of the system.

Integration testing ensures that even when parts of the system are built by different teams or at different times, they still function together as intended.