The art of debugging

I was reading “How to think like a computer scientist” and I liked a quote describing the art of debugging by elimination of impossible scenarios…

When you have eliminated the impossible, whatever remains, however improbable, must be the truth.

Sherlock Holmes (The sign of four)

The story behind reading that book is that I was interested to learn Python, just for the fun of it, and I found that book which is aimed for 1st year computer science students. I thought it would be interesting too to join the ride and start learning a new language assuming I had no experience too. 🙂

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Historical Debugger and Test Impact Analysis in Visual Studio Team System 2010

I was browsing some of the awaited-for Visual Studio 2010 and I found a video about two interesting features related to what we do everyday (and I do not mean coding ;))

The first feature is related to debugging “history”. Normally, when you find a bug while running your program, you insert multiple breakpoints on the statements you suspect might caused it, and repeat the scenario or restart the debug session.

With history debugging, you don’t need to do so, since the history debugger “logs” every event in your application, so you can “pause” running and inspect all the previous events and may be check if there were “swallowed” exceptions.

The second feature, is when you want to modify some “unit-tested” code either for bug fixing or refactoring, and you want to re-run the impacted tests. Normally it is hard to determine which tests are affected so you run all of them, but with Test Impact Analysis in VS 2010, you can get the impacted tests once you save your modifications, so you can either commit your changes or undo.

Here is the 19 minutes video showing these two features on Channel 9

Historical Debugger and Test Impact Analysis in Visual Studio Team System 2010