/usr/include/CppUTestExt/ is in libcpputest-dev 3.7.2-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/CppUTestExt/CodeMemoryReportFormatter.h
/usr/include/CppUTestExt/GMock.h
/usr/include/CppUTestExt/GTest.h
/usr/include/CppUTestExt/GTestConvertor.h
/usr/include/CppUTestExt/MemoryReportAllocator.h
/usr/include/CppUTestExt/MemoryReportFormatter.h
/usr/include/CppUTestExt/MemoryReporterPlugin.h
/usr/include/CppUTestExt/MockActualCall.h
/usr/include/CppUTestExt/MockCheckedActualCall.h
/usr/include/CppUTestExt/MockCheckedExpectedCall.h
/usr/include/CppUTestExt/MockExpectedCall.h
/usr/include/CppUTestExt/MockExpectedCallsList.h
/usr/include/CppUTestExt/MockFailure.h
/usr/include/CppUTestExt/MockNamedValue.h
/usr/include/CppUTestExt/MockSupport.h
/usr/include/CppUTestExt/MockSupportPlugin.h
/usr/include/CppUTestExt/MockSupport_c.h
/usr/include/CppUTestExt/OrderedTest.h