Add tests

test/controllers/public/cards_controller_test.rb

@@ -0,0 +1,21 @@
+require "test_helper"
+
+class Public::CardsControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    sign_in_as :kevin
+    @collection = collections(:writebook)
+    @card = cards(:logo)
+    @collection.publish
+  end
+
+  test "show" do
+    get public_collection_card_path(@collection.publication.key, @card)
+    assert_response :success
+  end
+
+  test "not found if the collection is not published" do
+    @collection.unpublish
+    get public_collection_card_path(@collection.publication.key, @card)
+    assert_response :not_found
+  end
+end