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Green Bar of Shangri-La

head shot of Matt Stephens smiling How often have you encountered variations on this comment: “I’ve made a small change to the code; now I run the tests… green bar! Great, my change didn’t introduce any new bugs.” While a comprehensive unit test suite can increase your confidence that you’re not introducing any new bugs, it …

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Aubry Thonon

CS101

One of the first things I learnt at University back in '85:

Axiom: "Testing never proves the absence of bugs, only their presence"

Corollary: "If you haven't found any bugs, you haven't tested everything."

Anybody that believes otherwise should have their heads examined. There's a good reason the term "Magic Numbers" was introduced in the Hacker's Jargon; the best you can hope from your software is that for everyday data input/output plus some weird instances we have foreseen, the software will behave in a polite manner.

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