Unit tests for parsing HTML w/ lxml.
Unit tests for parsing HTML w/ lxml.

Update issue 942
Enhanced unit tests so that relevant tests are run both against the old
HTMLParser based parser and the new (to be committed) lxml based parser.
The latter doesn't handle some special cases related to invalid syntax
and those tests are disabled.

After this change running unit tests successfully requirs lxml module
to be installed. My guess is that this breaks the build until someone
goes and installs lxml to the CI machine.

Senseg/robotframework,userzimmermann/robotframework-python3,Senseg/robotframework,Senseg/robotframework,userzimmermann/robotframework-python3,Senseg/robotframework,userzimmermann/robotframework-python3,Senseg/robotframework,userzimmermann/robotframework-python3,userzimmermann/robotframework-python3