/usr/lib/Wt/test/ is in witty-examples 3.3.3+dfsg-4.1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/Wt/test/CMakeLists.txt
/usr/lib/Wt/test/CMakeLists.txt.orig
/usr/lib/Wt/test/auth/
/usr/lib/Wt/test/auth/BCryptTest.C
/usr/lib/Wt/test/auth/SHA1Test.C
/usr/lib/Wt/test/chart/
/usr/lib/Wt/test/chart/WChartTest.C
/usr/lib/Wt/test/color/
/usr/lib/Wt/test/color/WColorTest.C
/usr/lib/Wt/test/dbo/
/usr/lib/Wt/test/dbo/Benchmark.C
/usr/lib/Wt/test/dbo/DboFixture.h
/usr/lib/Wt/test/dbo/DboTest.C
/usr/lib/Wt/test/dbo/DboTest2.C
/usr/lib/Wt/test/dbo/DboTest3.C
/usr/lib/Wt/test/dbo/JsonTest.C
/usr/lib/Wt/test/http/
/usr/lib/Wt/test/http/HttpClientTest.C
/usr/lib/Wt/test/json/
/usr/lib/Wt/test/json/JsonParserTest.C
/usr/lib/Wt/test/json/JsonSerializerTest.C
/usr/lib/Wt/test/json/UTF-8-test.json
/usr/lib/Wt/test/json/UTF-8-test2.json
/usr/lib/Wt/test/length/
/usr/lib/Wt/test/length/WLengthTest.C
/usr/lib/Wt/test/locale/
/usr/lib/Wt/test/locale/LocaleNumberTest.C
/usr/lib/Wt/test/mail/
/usr/lib/Wt/test/mail/MailClientTest.C
/usr/lib/Wt/test/models/
/usr/lib/Wt/test/models/WBatchEditProxyModelTest.C
/usr/lib/Wt/test/models/WStandardItemModelTest.C
/usr/lib/Wt/test/paintdevice/
/usr/lib/Wt/test/paintdevice/WRasterTest.C
/usr/lib/Wt/test/paintdevice/WSvgTest.C
/usr/lib/Wt/test/payment/
/usr/lib/Wt/test/payment/MoneyTest.C
/usr/lib/Wt/test/private/
/usr/lib/Wt/test/private/CExpressionParserTest.C
/usr/lib/Wt/test/private/DboImplTest.C
/usr/lib/Wt/test/private/HttpTest.C
/usr/lib/Wt/test/private/I18n.C
/usr/lib/Wt/test/private/i18n/
/usr/lib/Wt/test/private/i18n/international_argument_1.xml
/usr/lib/Wt/test/private/i18n/international_argument_1_nl.xml
/usr/lib/Wt/test/private/i18n/plain.xml
/usr/lib/Wt/test/private/i18n/plain_nl.xml
/usr/lib/Wt/test/private/i18n/plural.xml
/usr/lib/Wt/test/private/i18n/plural_err_1.xml
/usr/lib/Wt/test/private/i18n/plural_err_2.xml
/usr/lib/Wt/test/private/i18n/plural_err_3.xml
/usr/lib/Wt/test/private/i18n/plural_err_4.xml
/usr/lib/Wt/test/private/i18n/plural_err_5.xml
/usr/lib/Wt/test/private/i18n/plural_findcase_err1.xml
/usr/lib/Wt/test/private/i18n/plural_findcase_err2.xml
/usr/lib/Wt/test/private/i18n/plural_pl.xml
/usr/lib/Wt/test/render/
/usr/lib/Wt/test/render/BlockCssPropertyTest.C
/usr/lib/Wt/test/render/CssParserTest.C
/usr/lib/Wt/test/render/CssSelectorTest.C
/usr/lib/Wt/test/render/SpecificityTest.C
/usr/lib/Wt/test/render/WTextRendererTest.C
/usr/lib/Wt/test/test.C
/usr/lib/Wt/test/trampoline/
/usr/lib/Wt/test/trampoline/RefEncoder.C
/usr/lib/Wt/test/utf8/
/usr/lib/Wt/test/utf8/Utf8Test.C
/usr/lib/Wt/test/utf8/XmlTest.C
/usr/lib/Wt/test/utils/
/usr/lib/Wt/test/utils/Base64Test.C
/usr/lib/Wt/test/wdatetime/
/usr/lib/Wt/test/wdatetime/WDateTimeTest.C