Add API for postponing cards

test/controllers/cards/not_nows_controller_test.rb

@@ -9,8 +9,19 @@ class Cards::NotNowsControllerTest < ActionDispatch::IntegrationTest
     card = cards(:logo)
 
     assert_changes -> { card.reload.postponed? }, from: false, to: true do
-      post card_not_now_path(card)
+      post card_not_now_path(card), as: :turbo_stream
       assert_card_container_rerendered(card)
     end
   end
+
+  test "create as JSON" do
+    card = cards(:logo)
+
+    assert_not card.postponed?
+
+    post card_not_now_path(card), as: :json
+
+    assert_response :no_content
+    assert card.reload.postponed?
+  end
 end