On tor, 2009-08-27 at 09:58 -0400, Robert Haas wrote:
> To get positive results in which you can have confidence, you have to
> know that the testing which was done actually did a reasonably good
> job exercising the code in a way that would have flushed out bugs, had
> any been present. That sounds a lot like the definition of a
> regression test suite. Of course, we have that already, but it's
> nowhere near comprehensive. Maybe we should be looking at an expanded
> test suite that runs on a time scale of hours rather than seconds.
> Actually, didn't Peter talk about something like this at PGCon?
Let's look at it this way: If I were writing a compiler, then I would
have two main test approaches. First, I would have an in-tree test
suite that compiles a bunch of example code snippets and checks that the
results are reasonable. Call that a regression test. It would be
informed by code coverage analysis and previously reported bugs.
Second, as part of my release cycle, I would have an agenda to try to
compile a large set of real programs against my new compiler version.
I would do that during the beta period. You will notice that GCC pretty
much operates that way.
We have regression tests. They could and should be expanded. That's a
developer job, and we can start working on that now. But this
discussion was about what to do during beta. And I think during beta
you want to test PostgreSQL against a large set of real applications.
But we could try to clarify how to actually do that in an organized way.
Now, if you want to improve the regression tests, I would suggest going
through the commits since 8.4beta and since 8.4.0 final release and ask
how these problems could have been prevented or caught earlier. I
suppose a test suite for WAL might be part of the answer, but a closer
analysis might be insightful.
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