/usr/share/kivy-examples/application/testkvfile.kv is in python-kivy-examples 1.9.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | #:kivy 1.0
Button:
text: 'Hello from testkvfile.kv'
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