custom_plan.rb

require 'zeus/rails'

class CucumberPlan < Zeus::Rails
  def cucumber_environment
    require 'cucumber/rspec/disable_option_parser'
    require 'cucumber/cli/main'
    @cucumber_runtime = Cucumber::Runtime.new
  end

  def cucumber(argv=ARGV)
    cucumber_main = Cucumber::Cli::Main.new(argv.dup)
    had_failures = cucumber_main.execute!(@cucumber_runtime)
    exit_code = had_failures ? 1 : 0
    exit exit_code
  end
end

Zeus.plan = CucumberPlan.new

zeus.json

{
  "command": "ruby -rubygems -r./custom_plan -eZeus.go",

  "plan": {
    "boot": {
      "default_bundle": {
        "development_environment": {
          "prerake": {"rake": []},
          "runner": ["r"],
          "console": ["c"],
          "server": ["s"],
          "generate": ["g"],
          "destroy": ["d"],
          "dbconsole": []
        },
        "test_environment": {
          "cucumber_environment": {"cucumber": []},
          "test_helper": {"test": ["rspec", "testrb"]}
        }
      }
    }
  }
}