In case it helps anyone, this is the helper I used: https://gist.github.com/703175 https://gist.github.com/703175 The tidy lib is installed by default on the M

In case it helps anyone, this is the helper I used: https://gist.github.com/703175 https://gist.github.com/703175 The tidy lib is installed by default on the Mac. It's very fast (written in C) so it only adds a few seconds to my tests. (I'm leaving it in after the conversion.) Another tip: it helps to put a lot of <&bad"> tags in your fixtures, that will trigger a bunch of errors in the above test if you are not doing your escaping properly.