/usr/share/checkbox/jobs/install.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: shell name: install/apt-get-gets-updates requires: package.name == 'apt' user: root command: apt-get -d -y --force-yes dist-upgrade && true || false description: Tests to see that apt can access repositories and get updates (does not install updates). This is done to confirm that you could recover from an incomplete or broken update.