Create test for "break-apart" method

[matthiasbock]

Currently, the parser is XML-unaware. This will be changed (SAX).
In order not to break functionality during migration, a test file and a processed file (as success metric) should be added.

[matthiasbock]

break_apart() used by e.g. https://github.com/mb-make/foldable-text-generator/blob/master/cutter.py