DEV: Add test for categories_breadcrumb (#8791)

spec/helpers/topics_helper_spec.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe TopicsHelper do
+
+  describe "#categories_breadcrumb" do
+    let(:user) { Fabricate(:user) }
+
+    let(:category) { Fabricate(:category_with_definition) }
+    let(:subcategory) { Fabricate(:category_with_definition, parent_category_id: category.id) }
+    let(:subsubcategory) { Fabricate(:category_with_definition, parent_category_id: subcategory.id) }
+
+    it "works with sub-sub-categories" do
+      SiteSetting.max_category_nesting = 3
+      topic = Fabricate(:topic, category: subsubcategory)
+
+      breadcrumbs = helper.categories_breadcrumb(topic)
+      expect(breadcrumbs.length).to eq(3)
+      expect(breadcrumbs[0][:name]).to eq(category.name)
+      expect(breadcrumbs[1][:name]).to eq(subcategory.name)
+      expect(breadcrumbs[2][:name]).to eq(subsubcategory.name)
+    end
+  end
+end