The old test expected an incorrect wrapping due to the preview function
not using unicode properly, so it got the wrong length.
Signed-off-by: Johannes Löthberg <johannes@kyriasis.com>
This includes:
- Splitting out methods of a class into stand alone functions, to make
them easier to test.
- Adding unit tests to split out functions, testing HTML -> preview.
- Handle the fact that elements in lxml may have tail text.
