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Re: [PATCH 4/4] am: fix --interactive HEAD tree resolution




Hi Peff,

On Tue, 28 May 2019, Jeff King wrote:

> On Tue, May 28, 2019 at 01:06:21PM +0200, Johannes Schindelin wrote:
>
> > > Or do you prefer having a one-liner? I'd rather come up with a more
> > > generic helper to cover this case, that can run any command and compare
> > > it to a single argument (or stdin). E.g.,:
> > >
> > >   test_cmp_cmd no-conflict git log -1 --format=%s
> > >
> > > or
> > >
> > >   test_cmp_cmd - git foo <<-\EOF
> > >   multi-line
> > >   expectation
> > >   EOF
> >
> > I guess that you and me go into completely opposite directions here. I
> > want something *less* general. Because I want to optimize for the
> > unfortunate times when a test fails and most likely somebody else than the
> > original author of the test case is tasked with figuring out what the heck
> > goes wrong.
> >
> > You seem to want to optimize for writing test cases. Which I find -- with
> > all due respect -- the wrong thing to optimize for. It is already dirt
> > easy to write new test cases. But *good* test cases (i.e. easy to debug
> > ones)? Not so much.
>
> Hmm. I too want the test output to be useful to people other than the
> test author. But I find the output from test_cmp perfectly fine there.
> My first step in digging into a failure is usually to look at what
> commands the test is running, which generally makes it obvious why we
> are expecting one thing and seeing another (or at least, just as obvious
> as a hand-written message).
>
> So to me the two are equal on that front, which makes me want to go with
> the thing that is shorter to write, as it makes it more likely the test
> writer will write it. The _worst_ option IMHO is a straight-up use of
> "test" which provides no output at all in the test log of what value we
> _did_ see. That requires the person looking into the failure to re-run
> the test, which is hard if it's a remote CI, or if the failure does not
> always reproduce.

If you think your version is easier to debug, then I won't object.

Thanks,
Dscho