Explain in detail about integration testing, Software Engineering

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Explain in detail about Integration testing.

It is a systematic method for constructing the program structure.
Incremental integration - The program is constructed and tested in small increments.

Top-down integration

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

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