Many of the tests in javafx-ui-webnode crash under Linux (tested on Ubuntu).
I traced this down to Font::fontMetrics failing. fontMetrics calls Font::primaryFont, which calls fontFallbackList::primarySimpleFontData, which calls FontFallbackList::primaryFontData, which returns null.

This was introduced with the check-in for RT-20733.
Specifically, with these versions as the working directory (as reported by hg parents), things work:
. 1101:2fee67835377
apps 2116:e91adea3eefe
deploy 1217:ae3e7371b75e
media 1790:9690a6b13050
rt 802:dfbb8f49cd7a
rt-closed 15907:35c6d161a9bd
tests 1560:bfbbfd8b06cb
webnode 461:a9054928225a
With these versions, things crash:
. 1101:2fee67835377
apps 2116:e91adea3eefe
deploy 1217:ae3e7371b75e
media 1790:9690a6b13050
rt 802:dfbb8f49cd7a
rt-closed 15908:8ed36a9250ec
tests 1560:bfbbfd8b06cb
webnode 462:877428f4c393
where the difference is:

$ cd rt-closed; hg log -r 15908
changeset: 15908:8ed36a9250ec
user: malenkov
date: Fri Apr 13 13:31:50 2012 +0400
summary: RT-20733: CSS Font Family not applied correctly
$ cd ../webnode/; ]hg log -r 462
changeset: 462:877428f4c393
user: malenkov
date: Fri Apr 13 13:35:51 2012 +0400
summary: RT-20733: CSS Font Family not applied correctly