Validate bookmark URL uniqueness

spec/requests/create_post_spec.rb

@@ -176,6 +176,26 @@ RSpec.describe "Post creation", :db, :requests do
       expect(post_repo.bookmark_listing.count).to eq 1
       expect(post_repo.bookmark_listing.last.cached_content).to_not eq nil
     end
+
+    it "validates an already bookmarked URL" do
+      params = {
+        h: "entry",
+        "bookmark-of": "http://example.com",
+        name: "Name",
+        content: "Content of the post",
+        cache: "true"
+      }
+
+      post "/micropub", params
+
+      expect(last_response).to be_successful
+      expect(post_repo.bookmark_listing.count).to eq 1
+      expect(post_repo.bookmark_listing.last.cached_content).to_not eq nil
+      
+      post "/micropub", params
+      expect(last_response).to_not be_successful
+      expect(post_repo.bookmark_listing.count).to eq 1
+    end
   end
 
   context "checkins" do