diff --git a/spec/components/guardian/category_guardian_spec.rb b/spec/components/guardian/category_guardian_spec.rb
new file mode 100644
index 00000000000..3dccbb9e075
--- /dev/null
+++ b/spec/components/guardian/category_guardian_spec.rb
@@ -0,0 +1,47 @@
+require 'rails_helper'
+
+RSpec.describe CategoryGuardian do
+  let(:admin) { Fabricate(:admin) }
+  let(:guardian) { Guardian.new(admin) }
+  let(:category) { Fabricate(:category) }
+
+  describe '#cannot_delete_category_reason' do
+    describe 'when category is uncategorized' do
+      it 'should return the reason' do
+        category = Category.find(SiteSetting.uncategorized_category_id)
+
+        expect(guardian.cannot_delete_category_reason(category)).to eq(
+          I18n.t('category.cannot_delete.uncategorized')
+        )
+      end
+    end
+
+    describe 'when category has subcategories' do
+      it 'should return the right reason' do
+        category.subcategories << Fabricate(:category)
+
+        expect(guardian.cannot_delete_category_reason(category)).to eq(
+          I18n.t('category.cannot_delete.has_subcategories')
+        )
+      end
+    end
+
+    describe 'when category has topics' do
+      it 'should return the right reason' do
+        topic = Fabricate(:topic,
+          title: '</a><script>alert(document.cookie);</script><a>',
+          category: category
+        )
+
+        category.reload
+
+        expect(guardian.cannot_delete_category_reason(category)).to eq(
+          I18n.t('category.cannot_delete.topic_exists',
+            count: 1,
+            topic_link: "<a href=\"#{topic.url}\">&lt;/a&gt;&lt;script&gt;alert(document.cookie);&lt;/script&gt;&lt;a&gt;</a>"
+          )
+        )
+      end
+    end
+  end
+end