feat: add tests for helper

spec/helpers/collection_resources_helper_spec.rb

@@ -0,0 +1,20 @@
+require "rails_helper"
+
+RSpec.describe CollectionResourcesHelper do
+  let(:current_user) { create(:user, :data_coordinator) }
+  let(:user) { create(:user, :data_coordinator) }
+
+  describe "when displaying file metadata" do
+    context "with pages" do
+      it "returns correct metadata" do
+        expect(metadata_helper("2023_24_lettings_paper_form.pdf", 8)).to eq("PDF, 286 KB, 8 pages")
+      end
+    end
+
+    context "without pages" do
+      it "returns correct metadata" do
+        expect(metadata_helper("bulk-upload-lettings-template-2023-24.xlsx")).to eq("Microsoft Excel, 15 KB")
+      end
+    end
+  end
+end