fdo#55814: unit test is missing

Hi,

i've been told yesterday that the usage of writer is severly restricted.
All versions since 3.5 are affected. There is a bug for it:
https://bugs.freedesktop.org/show_bug.cgi?id=55814

I wonder why we don't have any unit test for that part of code?

Another question is bug prioritization. That one is clearly a blocker 
for me,
and belongs on ESC list of most critical bugs we have and should take 
care of.
May be we need a new category? How about "Most servere impact on customers"?

Anyway, to reproduce that one a trivial document with only two character 
is needed:

0
a

where

"0" is a variable "test" with the initial value 0
"a" is a section that should be hidden if the condition is met: "test EQ 1"

Changing the value of variable from 0 to 1 overrides currently the 
condition to "0",
leaving the section unhidden.

How can i create a unit test for that? Could you point me to some 
similar writer tests?
I would expect that programmatic construction of such a document 
shouldn't be hard.
Then change the variable from "0" to "1" and check that the section is 
removed from the
model, preserving the original condition.

Thanks
David