/usr/include/kdevplatform/tests/ is in kdevplatform-dev 5.0.3-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/kdevplatform/tests/autotestshell.h
/usr/include/kdevplatform/tests/json/
/usr/include/kdevplatform/tests/json/declarationvalidator.h
/usr/include/kdevplatform/tests/json/delayedoutput.h
/usr/include/kdevplatform/tests/json/jsondeclarationtests.h
/usr/include/kdevplatform/tests/json/jsonducontexttests.h
/usr/include/kdevplatform/tests/json/jsontesthelpers.h
/usr/include/kdevplatform/tests/json/jsontypetests.h
/usr/include/kdevplatform/tests/json/testsuite.cpp
/usr/include/kdevplatform/tests/json/testsuite.h
/usr/include/kdevplatform/tests/kdevsignalspy.h
/usr/include/kdevplatform/tests/modeltest.h
/usr/include/kdevplatform/tests/testcore.h
/usr/include/kdevplatform/tests/testfile.h
/usr/include/kdevplatform/tests/testhelpers.h
/usr/include/kdevplatform/tests/testlanguagecontroller.h
/usr/include/kdevplatform/tests/testplugincontroller.h
/usr/include/kdevplatform/tests/testproject.h
/usr/include/kdevplatform/tests/testsexport.h