what are the strengths of intergration testing over package and unit testing?

Answer 1

For any complex system, knowing that one has the desired behavior of the individual pieces ("unit testing") does not guarantee that the full assembled system will also work as expected.

Integration testing is important for finding issues that relate to the interplay of various components in the system.

Answer 2

The only thing to add to the answer above is that errors during integration testing will be harder to pin down. Both types of testing are required for a good product but are done at different times of the development lifecyle.

Answer 3

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