/usr/lib/python3/dist-packages/git/test/fixtures/ls_tree_commit is in python3-git 2.1.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | 040000 tree 2afb47bcedf21663580d5e6d2f406f08f3f65f19 foo
160000 commit d35b34c6e931b9da8f6941007a92c9c9a9b0141a bar
040000 tree f623ee576a09ca491c4a27e48c0dfe04be5f4a2e baz
|