如何使用rspec测试ActionCable和Devise？

Question

在我的Rails（5.1）应用程序中，我使用devise进行身份验证并使用ActionCable。

我的ActionCable连接如下所示：

module ApplicationCable
  class Connection < ActionCable::Connection::Base
    identified_by :current_user

    def connect
      puts 'current_user:', current_user.inspect

      self.current_user = find_verified_user
      logger.add_tags 'ActionCable', current_user.id
    end

    def disconnect
      # ...
    end

    protected

    def find_verified_user
      verified_user = env['warden'].user
      return verified_user if verified_user

      reject_unauthorized_connection
    end
  end
end

现在我想使用action-cable-testing gem进行测试：

require 'rails_helper'

RSpec.describe ApplicationCable::Connection, type: :channel do
  let(:user) { create(:user) }

  before do
    stub_connection(current_user: user)
  end

  it 'successfully connects' do
    expect { connect '/cable' }.to_not raise_error
  end
end

但是遇到了错误：

ApplicationCable::Connection
current_user:
nil
  successfully connects (FAILED - 1)

Failures:

  1) ApplicationCable::Connection successfully connects
     Failure/Error: expect { connect '/cable' }.to_not raise_error

       expected no Exception, got #<NoMethodError: undefined method `[]' for nil:NilClass> with backtrace:
         # ./app/channels/application_cable/connection.rb:19:in `find_verified_user'
         # ./app/channels/application_cable/connection.rb:8:in `connect'
         # /home/user/.rvm/gems/ruby-2.4.1/gems/action-cable-testing-0.3.1/lib/action_cable/connection/test_case.rb:176:in `connect'
         # ./spec/channels/user_channel_spec.rb:11:in `block (3 levels) in <top (required)>'
         # ./spec/channels/user_channel_spec.rb:11:in `block (2 levels) in <top (required)>'
     # ./spec/channels/user_channel_spec.rb:11:in `block (2 levels) in <top (required)>'

我有两个问题:

1. 为什么 current_user 的值是 nil？
2. 我该如何验证用户身份？

- neversleep

---

我发现在处理通道时，stub_connection很有意义，但对于连接来说则没有用处。 - neversleep

已解决。https://dev59.com/i5vga4cB1Zd3GeqPxiYr - neversleep

Answer 1

如果您想测试与“current_user”设置的连接，请按此处所示存根化“env [‘warden’]”。https://dev59.com/3LDla4cB1Zd3GeqP9Ya7#53841098 如果您想测试通道类，请使用已经集成到Rails 6中的action-cable-testing gem。

- Mario Amazing