[Isolated] Test python pacakges are installed when in an ADC region

Author: hgreebe

cookbooks/aws-parallelcluster-platform/spec/unit/recipes/cookbook_virtualenv_spec.rb

@@ -6,6 +6,7 @@
       cached(:python_version) { 'python_version' }
       cached(:system_pyenv_root) { 'system_pyenv_root' }
       cached(:virtualenv_path) { 'system_pyenv_root/versions/python_version/envs/cookbook_virtualenv' }
+      cached(:aws_region) { 'us-iso-test' }
 
       context "when cookbook virtualenv not installed yet" do
         cached(:chef_run) do
@@ -32,6 +33,14 @@
           expect(node.default['cluster']['cookbook_virtualenv_path']).to eq(virtualenv_path)
           is_expected.to write_node_attributes('dump node attributes')
         end
+
+        it 'installs python packages' do
+          is_expected.to run_bash("pip install").with(
+            user: 'root',
+            group: 'root',
+            cwd: "#{node['cluster']['base_dir']}"
+          ).with_code(/tar xzf cookbook-dependencies.tgz/)
+        end
       end
     end
   end