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11.10.1 What Are Integration Tests
In Rust, integration tests live completely outside the library being tested. Integration tests call the library the same way other code does, which also means they can only call public APIs.
The purpose of integration tests is to verify that multiple parts of the library work together correctly. This differs from unit tests, which are smaller and more focused. Unit tests test a single module in isolation and can also test private interfaces.
Sometimes code that works fine on its own can still fail when used together. Integration tests exist to find and solve such problems as early as possible. Therefore, integration test coverage is important.
