使用[“application / javascript”]替換request.formats：[“text / html”]

Question

那是我的carts_controller.rb。 默認情況下，控制器操作添加在/ app / views / carts /中呈現add.js.erb

class CartsController < ApplicationController
  def add
    find_cart_and_product
    @cart.products << @product
    CartMailer.product_added(@product).deliver_now
  end
end

和我的考驗

describe 'POST #add' do
  let(:cart_full_of){ create(:cart_with_products) }
  let(:product){ create(:product) }
  before do
    post :add, session: { cart_id: cart_full_of.id }, params: { product_id: product.id}
  end
  it { expect(response.status).to eq(200) }
  it { expect(response.headers["Content-Type"]).to eql("application/javascript"; charset=utf-8")}
  it { is_expected.to render_template :add }
  it 'should add current product into cart' do
    expect(cart_full_of.products).to eq([product])
  end
end

所有測試項目的常見錯誤都失敗了：

 Failure/Error: post :add, session: { cart_id: cart_full_of.id }, params: { product_id: product.id}

 ActionController::UnknownFormat:
   CartsController#add is missing a template for this request format and variant.

   request.formats: ["text/html"]
   request.variant: []

我考慮了預期請求格式的問題，所以如何強制使用request.formats進行測試渲染：[“application / javascript”]而不是[“text / html”]？

Answer 1

這對我有用（Rspec 3）：

before :each do
  request.headers["accept"] = 'application/javascript'
end