Header field manipulation
By varying the capitalization and adding certain headers to layer 7 protocols it is possible to detect on the receiving end if the traffic has been tampered with.
This tests needs to be properly specified in it's test page: https://trac.torproject.org/projects/tor/wiki/doc/OONI/Tests/HeaderFieldManipulation
and then implemented.
To upload designs, you'll need to enable LFS and have admin enable hashed storage. More information