/usr/share/installed-tests/gjs/testSystemExit.test is in gjs-tests 1.39.91-0ubuntu1.
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=gjs /usr/lib/gjs/gjs/installed-tests/scripts/testSystemExit.js
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