The testing of combined parts of an application to determine if they function correctly together is Integration testing. There are two methods of doing Integration Testing Bottom-up Integration testing and Top-Down Integration testing.
After performing integration testing of all the modules if any new functionality is added into that application then we can integrate it with our application and perform the integration testing called as incremental integration testing
1:Bottom-up integration
This testing begins with unit testing, followed by tests of progressively higher-level combinations of units called modules or builds.
This testing begins with unit testing, followed by tests of progressively higher-level combinations of units called modules or builds.
2:Top-Down integration
This testing, the highest-level modules are tested first and progressively lower-level modules are tested after that.
This testing, the highest-level modules are tested first and progressively lower-level modules are tested after that.
In a comprehensive software development environment, bottom-up testing is usually done first, followed by top-down testing. The process concludes with multiple tests of the complete application, preferably in scenarios designed to mimic those it will encounter in customers computers, systems and network.
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