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Published on Nov 25, 2012
Some people test in isolation, mocking everything except the class under test. We'll start with that idea, quickly examine the drawbacks, and ask how we might fix them without losing the benefits. This will send us on a trip through behavior vs. data, mutation vs. immutability, interface vs. data dependencies, how data shape affords parallelism, and what a system optimizing each of these for natural isolation might look like.