anchor.diff:  % Test cases
   -export([
       startup_speed/1,
  +    startup_speed_mining/1,
       sync_speed/1,
       stay_in_sync/1
   ]).
  
positive.code:     spec/3,
      setup_nodes/2,
      start_node/2,
      kill_node/2,
      request/3,
      wait_for_value/4,
  
negative.code: groups() ->
      [{long_chain, [], [
          startup_speed,
          startup_speed_mining,
          sync_speed,
          stay_in_sync
      ]}].
  