Working Effectively with Legacy Code by Michael C. Feathers

Author:Michael C. Feathers
Language: eng
Format: mobi, epub, pdf
Publisher: Prentice Hall PTR
Published: 2012-11-02T21:00:00+00:00

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When we refactor, we generally have to check for two things: Does the behavior exist after the refactoring, and is it connected correctly?

Many characterization tests look like “sunny day” tests. They don’t test many special conditions; they just verify that particular behaviors are present. From their presence, we can infer that refactorings that we’ve done to move or extract code have preserved behavior.

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How can we handle this? There are a couple of general strategies. One is to manually calculate the expected values for a piece of code. At each conversion, we see whether there is a truncation issue. Another technique is to use a debugger and step through assignments so that we can see what conversions a particular set of inputs triggers. A third technique is to use sensing variables (301) to verify that a particular path is being covered and that the conversions are exercised.

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