比如unicorn的配置文件（config/unicorn.rb）中默认这样写：
listen "/tmp/myapp/unicorn.sock", backlog: 1
pid "/tmp/myapp/unicorn.pid"
要根据实际运行环境和测试环境区分开，想这样实现：
if ENV["RAILS_ENV"] == "production"
listen "/tmp/myapp/unicorn.sock", backlog: 1
pid "/tmp/myapp/unicorn.pid"
else
listen "/tmp/myapp/test.sock", backlog: 1
pid "/tmp/myapp/test.pid"
end
却不能达到目的，有没有可行方法？
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