ruby - ActionCable channel 的 RSpec 测试中未定义方法 `stub_connection'

Question

我有以下测试:

require "rails_helper"

RSpec.describe MyChannel, type: :channel do
  let (:current_user) { User.first }

  it "subscribes to a unique room for the user" do
    stub_connection current_user: User.first
    subscribe
    expect(subscription).to be_confirmed
    expect(streams).to include("my_channel_#{current_user.id}")
  end
end

失败并出现以下错误:

 Failure/Error: stub_connection current_user: User.first

 NoMethodError:
   undefined method `stub_connection' for #<RSpec::ExampleGroups::MyChannel:0x00000000deadbeef>
 # ./spec/channels/my_channel_spec.rb:7:in `block (2 levels) in <top (required)>'

根据the documentation在我发现的所有示例中，stub_connection 应该在 RSpec channel 测试中自动可用。我做错了什么？

Answer 1

我需要安装 action-cable-testing gem 。当我写这个答案时，这个 gem 的功能是 slated to be integrated directly into Rails at some point in Rails 6 .

installing the gem之后，请确保require the gem in your rails_helper.rb file :

RSpec Usage

First, you need to have rspec-rails installed.

Second, add this to your "rails_helper.rb" after requiring environment.rb:

require "action_cable/testing/rspec"