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集成测试所做的是打开一个显示购买页面并单击Approve购买页面。这是 rspec 案例：

it "should display the approve page" do
      proj = FactoryGirl.create(:project)
      pur = FactoryGirl.create(:purchasing, :project_id => proj.id)
      visit project_purchasing_path(proj, pur)
      response.should have_selector("a", :href => approve_project_purchasing_path(proj, pur), :content => "Approve")
      click_link 'Approve'
end

click_link 'Approve'即使response只是验证页面上有'Approve'链接，最后一行也会导致以下错误：

ActionController::RoutingError:←[0m
           ←[31mNo route matches [GET] "/projects/1/purchasings/1/approve"

在输出中rake routes有一个路径approve_project_purchasing_path：

 approve_project_purchasing PUT    /projects/:project_id/purchasings/:id/approve(.:format)

单击 时代码执行完全没有错误'Approve'。

我们的 rspec 代码有什么问题？谢谢您的帮助。

更新：这是link_tofor Approve：

<%= link_to 'Approve', approve_project_purchasing_path(@project, @purchasing), :method => :put, :id => 'purchasing_need_approve', :confirm => 'Approve' + @purchasing.prod_name + '?' %>
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