/usr/share/installed-tests/appstream-glib/appdata-validate.test is in libappstream-glib-dev 0.5.13-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [Test]
Type=session
Exec=sh -c "/usr/bin/appstream-util validate-relax --nonet /usr/share/appdata/*.xml"
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