我很难理解如何在从api中获取消息的测试中使用webmock

Question

我目前正试图为这个方法编写一个测试：

#fetch message from api

def message_instance
    project_id = ENV['SIGNALWIRE_PROJECT_KEY']
    project_tkn = ENV['SIGNALWIRE_TOKEN']
    host_url = ENV['SIGNALWIRE_HOST']
@client = Signalwire::REST::Client.new project_id, project_tkn, signalwire_space_url: host_url
    message = @client.messages(sid).fetch
end

并且正在使用FactoryBot模拟接收到的消息@message = build : message，status：:received

但我无法理解如何测试这个方法的每一行。希望有人能打破我怎样才能正确地存根一个请求？

编辑:到目前为止，我已经尝试过这样的方法：

  describe 'message_instance' do
      it 'returns message instance' do
        
        allow(ENV).to receive(:[]).with('SIGNALWIRE_PROJECT_KEY').and_return('AC123')
        @message = build :message, status: 'received', sid: '123456789'
       
       
        @message.message_instance.should eq @client
        
      end
    end

返回此错误：

 "BUNDLER_ORIG_RUBYLIB"=>"BUNDLER_ENVIRONMENT_PRESERVER_INTENTIONALLY_NIL", "BUNDLER_ORIG_RUBYOPT"=>"BUNDLER_ENVIRONMENT_PRESERVER_INTENTIONALLY_NIL", "BUNDLE_GEMFILE"=>"/vagrant/oyetext-backend/Gemfile", "BUNDLE_BIN_PATH"=>"/usr/share/rvm/rubies/ruby-2.7.2/lib/ruby/gems/2.7.0/gems/bundler-2.1.4/libexec/bundle", "BUNDLER_VERSION"=>"2.1.4", "RUBYOPT"=>"-r/usr/share/rvm/rubies/ruby-2.7.2/lib/ruby/2.7.0/bundler/setup", "RUBYLIB"=>"", "RAILS_ENV"=>"test", "SIGNALWIRE_PROJECT_KEY"=>"test", "SIGNALWIRE_TOKEN"=>"test", "SIGNALWIRE_NUMBER"=>"+19999999999"} received :[] with unexpected arguments
         expected: ("SIGNALWIRE_PROJECT_KEY")
              got: ("SIGNALWIRE_TOKEN")
        Please stub a default value first if message might be received with other args as well. 

Answer 1

我并不认为顽固的ENV是一个好主意，因为您可以看到，它用于比代码逻辑更多的东西，比如bundler或ruby本身。

与其调用allow(ENV).to...，不如尝试使用以下方法：

ENV['SIGNALWIRE_PROJECT_KEY'] = 'AC123'