July 2009
Intermediate to advanced
544 pages
11h 24m
English
Content preview from Why Programs Fail, 2nd Edition
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CHAPTER 10 Asserting Expectations
Observation alone is not enough for debugging. One must compare the observed facts with the expected program behavior. In this chapter, we discuss how to automate such comparisons, using well-known assertion techniques. We also show how to ensure the sanity of important system components such as memory.
10.1 AUTOMATING OBSERVATION
Observing what is going on in a program can be a burden for a programmer. First, there are many states and events that can and must be observed. Second, for each new run (or each new defect) the same items must be observed again. The burden is not so much the observation itself but the act of judging whether the observed state is sane or not—which of course multiplies with the amount ...
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