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How Google Tests Software by Jeff Carollo, Jason Arbon, James A. Whittaker

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Chapter 2. The Software Engineer in Test

Imagine for a moment the perfect development process. It would begin with test. Before even a single line of code is written, a developer would ponder what it will take to test it. He will write tests for boundary cases, for data values too large and too small, for values that would push loops beyond their limits, and for a myriad of other concerns. Some of these tests will be part of the functions she writes, self-testing code or unit tests. For these types of tests, the person who writes the code and understands it best is the one who is most qualified to test it.

Other tests require knowledge outside the actual codebase and must rely on external infrastructure. For example, a test that retrieves data ...

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