在Rails中,您如何对Javascript响应格式进行功能测试？

Question

如果您的控制器操作如下所示:

respond_to do |format|
  format.html { raise 'Unsupported' }
  format.js # index.js.erb
end

你的功能测试看起来像这样:

test "javascript response..." do
  get :index
end

它将执行respond_to块的HTML分支.

如果你试试这个:

test "javascript response..." do
  get 'index.js'
end

它执行视图(index.js.erb)而没有运行控制器动作!

Answer 1

通过在:format你的正常PARAMS触发该格式的响应.

get :index, :format => 'js'

无需弄乱您的请求标头.

Answer 2

与rspec:

it "should render js" do
  xhr :get, 'index'
  response.content_type.should == Mime::JS
end

并在您的控制器操作中:

respond_to do |format|
  format.js
end

Answer 3

将接受的内容类型设置为您想要的类型:

@request.accept = "text/javascript"

将此与您的get :index测试相结合,它将对控制器进行适当的调用.

Answer 4

RSpec 3.7 and Rails 5.x solution:

A few of these answers were a little outdated in my case so I decided to provide an answer for those running Rails 5 and RSpec 3.7:

it "should render js" do
  get :index, xhr: true

  expect(response.content_type).to eq('text/javascript')
end

Very similar to Steve's answer with a few adjustments. The first being xhr is passed as a boolean key/pair. Second is I now use expect due to should receiving deprecation warnings if used. Comparing the content_type of the response to be equal to text/javascript worked for me.