/usr/share/augeas/lenses/dist/tests/test_hostname.aug is in augeas-lenses 1.2.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | module Test_Hostname =
test Hostname.lns get "local.localnet\n" =
{ "hostname" = "local.localnet" }
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