/usr/share/installed-tests/clutter/group.test is in clutter-1.0-tests 1.26.0+dfsg-3.
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=env G_ENABLE_DIAGNOSTIC=0 CLUTTER_ENABLE_DIAGNOSTIC=0 /usr/lib/clutter-1.0/installed-tests/clutter/group
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