Scantailor 0.9.11.1: Cmake test suite fails

[Daniel Stender <daniel@danielstender.com>]

Hi guys,

I'm working on packaging the scanned documents post processor Scantailor, and so
far during build the test suite fails (with an override the package builds through).
The failure is that:

<cut>
make[1]: Entering directory `/tmp/buildd/scantailor-0.9.11.1/obj-x86_64-linux-gnu'
Running tests...
/usr/bin/ctest --force-new-ctest-process -j1
Test project /tmp/buildd/scantailor-0.9.11.1/obj-x86_64-linux-gnu
    Start 1: ImageProcTests
1/2 Test #1: ImageProcTests ...................***Failed    0.08 sec
No protocol specified
test: cannot connect to X server :0
Running 86 test cases...

    Start 2: ScanTaylorTests
2/2 Test #2: ScanTaylorTests ..................   Passed    0.01 sec

50% tests passed, 1 tests failed out of 2

Total Test time (real) =   0.10 sec

The following tests FAILED:
	  1 - ImageProcTests (Failed)
Errors while running CTest
make[1]: *** [test] Error 8
</cut>

I would be thankful for every hint, and of course other pointers towards what has
been created so far (please, cf. http://anonscm.debian.org/gitweb/?p=collab-maint/scantailor.git).

Greetings,
Daniel Stender