/usr/share/checkbox/jobs/panel_reboot.txt is in checkbox 0.13.7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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plugin: manual name: panel_reboot_test requires: package.name == 'linux' description: PURPOSE: This test will verify that you can reboot your system from the desktop menu STEPS: 1. Click the Gear icon in the upper right corner of the desktop and click on "Shut Down" 2. Click the "Restart" button on the left side of the Shut Down dialog 3. After logging back in, restart System Testing and it should resume here VERIFICATION: Did your system restart and bring up the GUI login cleanly?