ruby-on-rails - RSpec Helper 参数问题

Question

我正在尝试测试以下代码:

module ApplicationHelper
  def current_book
    Book.find(params[:id])
  end
end

使用 RSpec 进行以下测试:

RSpec.describe ApplicationHelper, :type => :helper do
  describe "#current_book" do
    book_1 = create(:book)

    params = {}
    params[:id] = book_1.id

    expect(helper.current_book).to eq(book_1)
  end
end

但由于某些原因，params[:id] 参数没有正确传递。有什么建议吗？

Answer 1

您需要 stub 参数:

RSpec.describe ApplicationHelper, type: :helper do
  describe "#current_book" do
    let(:first_book) { create(:book) }

    before(:all) { helper.stub!(:params).and_return(id: 1) }

    it "returns a book with a matching id" do
      expect(helper.current_book).to eq(first_book)
    end
  end
end