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Top-down and bottom-up, both the types of testing have their advantages and disadvantages. While in top-down integration testing it is very easy to follow the top-down software development process at the same time in bottom-up testing, the code is used mostly is tested repetitively.
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In hybrid integration testing approach, we try to leverage benefits of top-down and bottom-up, both the types of testing.
While it is important to take benefit of both the approaches using hybrid integration techniques, we need to make sure that we do it thoroughly. Otherwise it will be very difficult to identify which modules are tested using top down and which one are tested using bottom up. You might end up missing some modules altogether in this case if proper caution is not exercised.
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