Very nice to see activity on Abiword. The enthusiasm of the author is evident.
Abiword does have support for ODF, but it could be better. Abiword 3 uses ODF 1.1. At the last ODF plugfest quite some issues were found [1, end of page].
There are now automatic tests than can be run to improve ODF support. The tests can be run from the command-line and give output as HTML [2].
Currently, there is a project underway that makes it possible to run the tests on a public test server which will show live results.
hub asks for tests in his blog post. For loading, saving and rending ODF files, the ODF community can help.
[1] http://odfplugfest.org/2015-thehague/report.html [2] http://autotests.opendocumentformat.org/