anchor.diff:      cuttlefish_unit:assert_config(Config, "riak_core.ssl.certfile", "/absolute/etc/cert.pem"),
       cuttlefish_unit:assert_config(Config, "riak_core.ssl.keyfile", "/absolute/etc/key.pem"),
       cuttlefish_unit:assert_config(Config, "riak_core.ssl.cacertfile", "/absolute/etc/cacertfile.pem"),
  +    cuttlefish_unit:assert_config(Config, "riak_core.handoff_ip", "1.2.3.4"),
       cuttlefish_unit:assert_config(Config, "riak_core.handoff_port", 8888),
       cuttlefish_unit:assert_config(Config, "riak_core.handoff_ssl_options.certfile", "/tmp/erlserver.pem"),
       cuttlefish_unit:assert_config(Config, "riak_core.handoff_ssl_options.keyfile", "/tmp/erlkey/pem"),
  
positive.code:         {["ssl", "certfile"], "/absolute/etc/cert.pem"},
          {["ssl", "keyfile"], "/absolute/etc/key.pem"},
          {["ssl", "cacertfile"], "/absolute/etc/cacertfile.pem"},
          {["handoff", "port"], 8888},
          {["handoff", "ssl", "certfile"], "/tmp/erlserver.pem"},
          {["handoff", "ssl", "keyfile"], "/tmp/erlkey/pem"},
  
negative.code: %% in real life.
  context() ->
      [
          {handoff_ip, "0.0.0.0"},
          {handoff_port, "8099"},
          {platform_bin_dir , "./bin"},
          {platform_data_dir, "./data"},
  