Diffing string checker

[Andrew Wilkins]

On Fri, Feb 26, 2016 at 12:04 AM Eric Snow <eric.snow at canonical.com> wrote:

> On Wed, Feb 24, 2016 at 11:26 PM, Andrew Wilkins
> <andrew.wilkins at canonical.com> wrote:
> > Howdy,
> >
> > Occasionally I'll change a test, and some string equality test will fail
> > with a wall of text. Sometimes we shouldn't be checking the whole string,
> > but sometimes it's legitimate to do so, and it can be difficult/tedious
> to
> > spot the differences.
> >
> > I've just written a checker which diffs the two string args, and
> colourises
> > the output. You may find it useful. I'm using red/green background, but I
> > also added bold for insertions, strike-through for deletions, in case
> you're
> > red/green colour blind. My terminal doesn't do strike-through, and your's
> > probably doesn't either. Anyway, the important thing is you can see the
> > difference between bits that are the same vs. insertions/deletions.
> >
> > Code is at github.com/axw/fancycheck. Just replace
> >     c.Assert("x", gc.Equals, "y")
> > with
> >     c.Assert("x", fancycheck.StringEquals, "y")
>
> FYI, I added something like this to the juju repo a while back:
>
> https://github.com/juju/juju/blob/master/testing/base.go#L166
>
> It's not a gc checker like yours but it has the same effect.
>

https://github.com/juju/juju/blob/master/testing/base.go#L173
:)
Thanks, Eric. Maybe we should update that to use diffmatchpatch. Or we
could just settle on an output filtering tool, rather than changing all of
the tests.

-eric
>
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