Integration testing is designed to test the structure and the architecture of the software and determine whether all software components interface properly. It does not verify that the system is functionally correct, only that it performs as designed.
Integration testing is the process of identifying errors introduced by combining individual program unit-tested modules. It should not begin until all units are known to perform according to the unit specifications. Integration testing can start with testing several logical units or can incorporate all units in a single integration test.
Because the primary concern in integration testing is that the units interface properly, the objective of this test is to ensure that they integrate, that parameters are passed, and the file processing is correct. Integration testing techniques include top-down, bottom-up, sandwich testing, and thread testing.
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