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What is Integration Testing?

Integration testing is defined as the testing of joint parts of an application to decide if they function appropriately. 

Integration testing can be performed in two methods:

1. Bottom-up integration testing: This testing commences with unit testing, followed by tests of gradually higher-level combinations of units called modules or builds.

2. Top-down integration testing: In this testing, the highest-level modules or builds are tested first and gradually, lower-level modules are tested afterward.

Bottom-up testing is generally done first, followed by top-down testing in a complete software development environment. The process ends with multiple tests of the whole application.

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