Add spec to check that counter is incremented

This regression has happened twice so it would be good to have a feature
spec for this

spec/features/frequently_visited_projects_and_groups_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'Frequently visited items', :js do
+  let_it_be(:user) { create(:user) }
+
+  before do
+    sign_in(user)
+  end
+
+  context 'for projects' do
+    let_it_be(:project) { create(:project, :public) }
+
+    it 'increments localStorage counter when visiting the project' do
+      visit project_path(project)
+
+      frequent_projects = nil
+
+      wait_for('localStorage frequent-projects') do
+        frequent_projects = page.evaluate_script("localStorage['#{user.username}/frequent-projects']")
+
+        frequent_projects.present?
+      end
+
+      expect(Gitlab::Json.parse(frequent_projects)).to contain_exactly(a_hash_including('id' => project.id, 'frequency' => 1))
+    end
+  end
+
+  context 'for groups' do
+    let_it_be(:group) { create(:group, :public) }
+
+    it 'increments localStorage counter when visiting the group' do
+      visit group_path(group)
+
+      frequent_groups = nil
+
+      wait_for('localStorage frequent-groups') do
+        frequent_groups = page.evaluate_script("localStorage['#{user.username}/frequent-groups']")
+
+        frequent_groups.present?
+      end
+
+      expect(Gitlab::Json.parse(frequent_groups)).to contain_exactly(a_hash_including('id' => group.id, 'frequency' => 1))
+    end
+  end
+end