Discuss in details about integration testing, Software Engineering

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Discuss in details about Integration testing.

It is a systematic procedure to construct the program structure.
Incremental integration - The program is built and tested in small increments.

Top-down integration

It is an incremental method.
Modules are integrated by moving downward through the control hierarchy starting with the chief control module(main program).
Subordinate parts are incorporated by depth-first or breadth-first way.

Bottom-up integration

This testing starts construction and testing with the elements at the lowest levels in the program structure.

Regression testing

It is the re-execution of some subset of tests that have previously been conducted to make certain the changes that have not been propagated unintended side effects.

Smoke testing

It reduces the integration risk.
Error analysis and correction are simplified.

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