make base to image connectio and use image instances instead of names

spec/features/merged/images_spec.rb

@@ -7,5 +7,11 @@ RSpec.feature "Images", type: :feature do
       expect(page).to have_title("Dummy")
       expect(page).to have_text("Pages")
     end
+    it "has picures" do
+      expexted_num = Merged::Image.count
+      visit "/merged/images"
+      found= find_all(".image_box").count
+      expect(found).to be expexted_num
+    end
   end
 end