Time Machine
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Hi,
From a discussion I had with Kent Beck about Continuous Testing / Autotest (see http://pharocasts.blogspot.com/2010/07/live-testing-with-autotest.html ), I would like to add a kind of Time Machine for Smalltalk code in Autotest.
When a test fails, what I really want to know is why. Sometimes a test fails and I don't know why. So I have to go through a debugging session which distracts me from what I've been coding.
So an idea is to diff backtrace before and after the test fails:
- revert to last green - replay the test and save the trace
- forward to current test and run (test fails)
- compare execution paths in order to see the consequence of last change
How would you do this ? Where should I look for materials which can help me coding this ? Cheers,
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sound cool.
looks like a research topic on it own. > When a test fails, what I really want to know is why. Sometimes a test fails and I don't know why. So I have to go through a debugging session which distracts me from what I've been coding. > > So an idea is to diff backtrace before and after the test fails: > - revert to last green > - replay the test and save the trace > - forward to current test and run (test fails) > - compare execution paths in order to see the consequence of last change > > How would you do this ? Where should I look for materials which can help me coding this ? I would use MethodWrapper or the like (may be byetsurgeon when available) and you can also have a look at dynamix (a famix extension in the Phd of orla greevy) to model trace. then you keep track of what changed using a changeset and revert. Stef _______________________________________________ Pharo-project mailing list [hidden email] http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project |
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In reply to this post by laurent laffont
> - compare execution paths in order to see the consequence of last change
Not easy to get. But yes, this is what the whole world wants :-) Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. _______________________________________________ Pharo-project mailing list [hidden email] http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project |
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In reply to this post by laurent laffont
did you read delta debugging from andreas Zeller?
Stef On Jul 22, 2010, at 11:11 PM, laurent laffont wrote: > Hi, > > From a discussion I had with Kent Beck about Continuous Testing / Autotest (see http://pharocasts.blogspot.com/2010/07/live-testing-with-autotest.html ), I would like to add a kind of Time Machine for Smalltalk code in Autotest. > > When a test fails, what I really want to know is why. Sometimes a test fails and I don't know why. So I have to go through a debugging session which distracts me from what I've been coding. > > So an idea is to diff backtrace before and after the test fails: > - revert to last green > - replay the test and save the trace > - forward to current test and run (test fails) > - compare execution paths in order to see the consequence of last change > > How would you do this ? Where should I look for materials which can help me coding this ? > > Cheers, > > Laurent Laffont > > http://pharocasts.blogspot.com/ > http://magaloma.blogspot.com/ > _______________________________________________ > Pharo-project mailing list > [hidden email] > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project _______________________________________________ Pharo-project mailing list [hidden email] http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project |
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On Thu, Jul 22, 2010 at 11:34 PM, Stéphane Ducasse <[hidden email]> wrote: did you read delta debugging from andreas Zeller? No. Where ? Laurent
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http://www.st.cs.uni-saarland.de/dd/
you can get some papers but also the slides that go with the book Stef On Jul 22, 2010, at 11:36 PM, laurent laffont wrote: > > On Thu, Jul 22, 2010 at 11:34 PM, Stéphane Ducasse <[hidden email]> wrote: > did you read delta debugging from andreas Zeller? > > No. Where ? > > Laurent > > > > Stef > > On Jul 22, 2010, at 11:11 PM, laurent laffont wrote: > > > Hi, > > > > From a discussion I had with Kent Beck about Continuous Testing / Autotest (see http://pharocasts.blogspot.com/2010/07/live-testing-with-autotest.html ), I would like to add a kind of Time Machine for Smalltalk code in Autotest. > > > > When a test fails, what I really want to know is why. Sometimes a test fails and I don't know why. So I have to go through a debugging session which distracts me from what I've been coding. > > > > So an idea is to diff backtrace before and after the test fails: > > - revert to last green > > - replay the test and save the trace > > - forward to current test and run (test fails) > > - compare execution paths in order to see the consequence of last change > > > > How would you do this ? Where should I look for materials which can help me coding this ? > > > > Cheers, > > > > Laurent Laffont > > > > http://pharocasts.blogspot.com/ > > http://magaloma.blogspot.com/ > > _______________________________________________ > > Pharo-project mailing list > > [hidden email] > > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project > > > _______________________________________________ > Pharo-project mailing list > [hidden email] > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project > > _______________________________________________ > Pharo-project mailing list > [hidden email] > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project _______________________________________________ Pharo-project mailing list [hidden email] http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project |
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I've ordered "Why programs fail" by Andreas Zeller.
It will be my summer holidays book ;) On Thu, Jul 22, 2010 at 11:52 PM, Stéphane Ducasse <[hidden email]> wrote: > http://www.st.cs.uni-saarland.de/dd/ > you can get some papers but also the slides that go with the book > Stef > > On Jul 22, 2010, at 11:36 PM, laurent laffont wrote: > >> >> On Thu, Jul 22, 2010 at 11:34 PM, Stéphane Ducasse <[hidden email]> wrote: >> did you read delta debugging from andreas Zeller? >> >> No. Where ? >> >> Laurent >> >> >> >> Stef >> >> On Jul 22, 2010, at 11:11 PM, laurent laffont wrote: >> >> > Hi, >> > >> > From a discussion I had with Kent Beck about Continuous Testing / Autotest (see http://pharocasts.blogspot.com/2010/07/live-testing-with-autotest.html ), I would like to add a kind of Time Machine for Smalltalk code in Autotest. >> > >> > When a test fails, what I really want to know is why. Sometimes a test fails and I don't know why. So I have to go through a debugging session which distracts me from what I've been coding. >> > >> > So an idea is to diff backtrace before and after the test fails: >> > - revert to last green >> > - replay the test and save the trace >> > - forward to current test and run (test fails) >> > - compare execution paths in order to see the consequence of last change >> > >> > How would you do this ? Where should I look for materials which can help me coding this ? >> > >> > Cheers, >> > >> > Laurent Laffont >> > >> > http://pharocasts.blogspot.com/ >> > http://magaloma.blogspot.com/ >> > _______________________________________________ >> > Pharo-project mailing list >> > [hidden email] >> > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project >> >> >> _______________________________________________ >> Pharo-project mailing list >> [hidden email] >> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project >> >> _______________________________________________ >> Pharo-project mailing list >> [hidden email] >> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project > > > _______________________________________________ > Pharo-project mailing list > [hidden email] > http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project > -- Patrick Barroca _______________________________________________ Pharo-project mailing list [hidden email] http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project |
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