#And here is my test:

    it "passes the token" do
      get :new, nil,
        :authorization => ActionController::HttpAuthentication::Token.encode_credentials("test_access1")

      assigns(:token).should be "test_access1"
    end

#Here's my before filter:

    def restrict_access
      authenticate_or_request_with_http_token do |token, options|
        api_key = ApiKey.find_by_access_token(token)
        @user = api_key.user unless api_key.nil?
        @token = token #set just for the sake of testing
        !api_key.nil?
      end 
    end