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Release It! by Michael T. Nygard

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Pattern5.7 Test Harness

As you’ve seen in previous chapters, distributed systems have failure modes that are extraordinarily difficult to provoke in development or QA environments. To be more thorough about testing various components together, we often resort to an “integration testing” environment. In this environment, our system is fully integrated to all the other systems it must interact with.

Integration testing presents problems of its own, however. What version should we test against? For greatest assurance, we’d like to test against the versions of our dependencies that will be current when we release our system. I could construct a mathematical ...

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