Add tests for application helper

spec/helpers/application_helper.rb

@@ -0,0 +1,20 @@
+require "rails_helper"
+
+RSpec.describe ApplicationHelper do
+  form_handler = FormHandler.instance
+  let(:form) { form_handler.get_form("test_form") }
+  let(:subsection) { form.get_subsection("household_characteristics") }
+  let(:case_log) { FactoryBot.build(:case_log, :in_progress) }
+
+  describe "browser_title" do
+    it "returns correct browser title when title is given" do
+      expect(browser_title("title"))
+        .to eq("title - #{t('service_name')} - GOV.UK")
+    end
+
+    it "returns correct browser title when title is not given" do
+      expect(browser_title(nil))
+        .to eq("#{t('service_name')} - GOV.UK")
+    end
+  end
+end