/usr/share/doc/junit4/api/org/junit/experimental/categories/ is in junit4-doc 4.12-6.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/junit4/api/org/junit/experimental/categories/Categories.CategoryFilter.html
/usr/share/doc/junit4/api/org/junit/experimental/categories/Categories.ExcludeCategory.html
/usr/share/doc/junit4/api/org/junit/experimental/categories/Categories.IncludeCategory.html
/usr/share/doc/junit4/api/org/junit/experimental/categories/Categories.html
/usr/share/doc/junit4/api/org/junit/experimental/categories/Category.html
/usr/share/doc/junit4/api/org/junit/experimental/categories/CategoryValidator.html
/usr/share/doc/junit4/api/org/junit/experimental/categories/ExcludeCategories.html
/usr/share/doc/junit4/api/org/junit/experimental/categories/IncludeCategories.html
/usr/share/doc/junit4/api/org/junit/experimental/categories/package-frame.html
/usr/share/doc/junit4/api/org/junit/experimental/categories/package-summary.html
/usr/share/doc/junit4/api/org/junit/experimental/categories/package-tree.html