May 15
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Integration testing is the phase where individual software modules are combined and tested as a group. It focuses on the interfaces and the flow of data between different parts of the system. These tests ensure that a unit of code still works correctly when it interacts with a database or an external API. Integration tests catch bugs that unit tests miss like incorrect database queries or broken network connections. They are generally slower than unit tests because they involve actual input and output operations. Developers often use a dedicated test environment that mimics the production setup to run these tests. Common strategies include Top-Down Bottom-Up or the Big Bang approach to connecting modules. Successful integration testing proves that the various components of an architecture can coexist and communicate. It serves as the critical bridge between testing isolated logic and testing the entire user journey.