$ perl6 -I lib t/010_packet_ack.t 
1..7
Type check failed for return value; expected Game::Tetrachromat::Packet but got Any (Any)
  in method read_packet at /home/tmurray/proj/Game-Tetrachromat/lib/Game/Tetrachromat/PacketFactory.pm6 (Game::Tetrachromat::PacketFactory) line 79
  in block <unit> at t/010_packet_ack.t line 33

# Looks like you planned 7 tests, but ran 0