RSpec：未定义的方法'double'；对于#<；RSpec:：Core:：ExampleGroup:：嵌套的\u 1:0x007fcc2f626d50>；

我编写了一个简单的测试，如下所示：

    require 'spec_helper.rb'

describe Channel do
  before(:each) do
    @channel = Channel.new
  end

  it "should get the true view count" do 
    upload_view_count = double('upload view count')
    upload_view_count.should_receive(:upload_num).and_return(16000666)
    @channel.upload_view_counts << upload_view_count
    @channel.save()
    @channel.true_all_time_views.should equal(16000666)
  end

  it "should get the true view count with multiple upload view counts" do
    upload_vc1 = double('uplaod view count 1')
    upload_vc1.should_receive(:created_at).and_return(Time.now())
    upload_vc1.should_receive(:upload_num).and_return(17666)
    upload_vc1.should_receive(:updated_at).and_return(Time.now())

    upload_vc2 = double('upload view count 2')
    upload_vc2.should_receive(:created_at).and_return(Time.now())
    upload_vc2.should_receive(:upload_num).and_return(17777)
    upload_vc2.should_receive(:updated_at).and_return(Time.now())

    @channel.upload_view_counts << upload_vc1
    @channel.upload_view_counts << upload_vc2
    @channel.save()
    @channel.true_all_time_views.should equal(17777)
  end




end

需要“spec\u helper.rb”
描述频道做什么
在…之前做
@channel=channel.new
终止
它“应该获得真实的视图计数”这样做
上传查看次数=双倍（“上传查看次数”）
上传\查看\计数。应\接收（：上传\数量）。并\返回（16000666）
@channel.upload_view_counts的结果是：mocha的config.mock_行错误地包含在我的spec_helper.rb文件中。删除它就成功了。
最终导致config.mock_with:mocha一行错误地包含在我的spec_helper.rb文件中。移除它成功了