Add unauthorized_entity to authenticate_for's default for called by c…

…allback (nsarno#228)

- Add failing test authenticate_for namespaced model

test/dummy/test/controllers/v1/test_namespaced_controller_test.rb

@@ -3,17 +3,25 @@
 
 module Knock
   class TestNamespacedControllerTest < ActionDispatch::IntegrationTest
-
     setup do
       @user = V1::User.first
+      @token = Knock::AuthToken.new(payload: { sub: @user.id }).token
     end
 
     test "allow namespaced models" do
-      token = Knock::AuthToken.new(payload: { sub: @user.id }).token
-      get v1_test_namespaced_index_url, headers: {'Authorization': "Bearer #{token}"}
+      get v1_test_namespaced_index_url, headers: {'Authorization': "Bearer #{@token}"}
       assert_response :ok
       assert_equal @user, @controller.current_v1_user
     end
 
+    test 'responds with unauthorized' do
+      get v1_test_namespaced_index_url
+      assert_response :unauthorized
+    end
+
+    test 'responds with unauthorized with invalid token in header' do
+      get v1_test_namespaced_index_url, headers: {'Authorization': 'Bearer invalid'}
+      assert_response :unauthorized
+    end
   end
 end