/usr/include/opengm/unittests/ is in libopengm-dev 2.3.6+20160905-1.
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..
/usr/include/opengm/unittests/blackboxtester.hxx
/usr/include/opengm/unittests/blackboxtests/
/usr/include/opengm/unittests/blackboxtests/blackboxtestbase.hxx
/usr/include/opengm/unittests/blackboxtests/blackboxtestfull.hxx
/usr/include/opengm/unittests/blackboxtests/blackboxtestgrid.hxx
/usr/include/opengm/unittests/blackboxtests/blackboxtesthigherordergrid.hxx
/usr/include/opengm/unittests/blackboxtests/blackboxteststar.hxx
/usr/include/opengm/unittests/inferencetester.hxx
/usr/include/opengm/unittests/inferencetests/
/usr/include/opengm/unittests/inferencetests/test_base.hxx
/usr/include/opengm/unittests/inferencetests/test_blackbox.hxx
/usr/include/opengm/unittests/inferencetests/test_empty.hxx
/usr/include/opengm/unittests/inferencetests/test_functions.hxx
/usr/include/opengm/unittests/inferencetests/test_hdf5_file.hxx
/usr/include/opengm/unittests/inferencetests/test_multimode.hxx
/usr/include/opengm/unittests/test.hxx
/usr/include/opengm/unittests/test_inference_blackboxtest.hxx