Add ChefSpec tests for packages recipe

Summary:
Add spec coverage for the packages recipe which manages logrotate and
pigz package installation. Tests verify the package upgrade behavior
based on the manage_packages attribute.

Differential Revision: D88485611

fbshipit-source-id: 81a5903308899bb37f0912a8187e26f05cdc3a85

Author: dafyddcrosby

cookbooks/fb_logrotate/spec/packages_spec.rb

@@ -0,0 +1,40 @@
+# Copyright (c) 2025-present, Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+require './spec/spec_helper'
+
+recipe 'fb_logrotate::packages', :unsupported => [:mac_os_x] do |tc|
+  let(:chef_run) do
+    tc.chef_run
+  end
+
+  context 'when manage_packages is true' do
+    it 'upgrades logrotate and pigz packages' do
+      chef_run.converge(described_recipe) do |node|
+        node.default['fb_logrotate']['manage_packages'] = true
+      end
+      expect(chef_run).to upgrade_package(%w{logrotate pigz})
+    end
+  end
+
+  context 'when manage_packages is false' do
+    it 'does not upgrade logrotate and pigz packages' do
+      chef_run.converge(described_recipe) do |node|
+        node.default['fb_logrotate']['manage_packages'] = false
+      end
+      expect(chef_run).not_to upgrade_package(%w{logrotate pigz})
+    end
+  end
+end