/usr/share/doc/ettercap-common/TODO.TESTING is in ettercap-common 1:0.8.0-11.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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  THINGS THAT NEED TO BE TESTED
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   + WIFI
      - test the decoder with adapters other than cisco aironet
   + Core
      - Check the checksumming code as it reports invalid checksum on some packets
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