在 Rails 环境中使用 Rspec 测试 Rake 任务

我正在尝试测试一个 rake 任务，它在其中使用了一个活动记录.

I'm trying to test a rake task and it uses an active record in it.

require 'spec_helper'
require 'rake'

load File.join(Rails.root, 'lib', 'tasks', 'survey.rake')

describe "survey rake tasks" do
  describe "survey:send_report" do
    it "should send a report" do
      Rake::Task['survey:send_report'].invoke
    end
  end
end

当我运行这个规范 rspec spec/lib/survey_spec.rb 时，我得到这个错误

When I run this spec rspec spec/lib/survey_spec.rb, I get this error "

RuntimeError:
   Don't know how to build task 'environment'

如何通过示例规范在内部加载 :enviroment 任务?

How do I load the :enviroment task inside by example spec?