FEATURE: Autolinking to category using hashtags.

spec/models/category_spec.rb

@@ -503,6 +503,22 @@ describe Category do
     end
   end
 
+  describe "#url_with_id" do
+    let(:category) { Fabricate(:category, name: 'cats') }
+
+    it "includes the id in the URL" do
+      expect(category.url_with_id).to eq("/c/#{category.id}-cats")
+    end
+
+    context "child category" do
+      let(:child_category) { Fabricate(:category, parent_category_id: category.id, name: 'dogs') }
+
+      it "includes the id in the URL" do
+        expect(child_category.url_with_id).to eq("/c/cats/dogs/#{child_category.id}")
+      end
+    end
+  end
+
   describe "uncategorized" do
     let(:cat) { Category.where(id: SiteSetting.uncategorized_category_id).first }