[Simpletest-support] Error output among websites regular output

[Anders A. <tr...@gm...>]

I am getting started testing a website and for most tests I want to run the
code that generates each webpage.

My issue with this is that the webpage output is shown in the test result,
and any errors that occur get rendered by simpletest in the middle of the
page as they happen.

If there's a good way to handle this I can't see it.
I would like to not see the regular html output, I only want the errors.
The page may be rendered in such a way that errors end up in an invisible
block, or some javascript gets triggered and messes up the test result page.
I can hide the website content by trapping it in an output buffer, but as
it is now I won't see the errors because simpletest prints those to the
same output.

Any suggestions?