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

Author: hgreebe

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

@@ -8,11 +8,6 @@
       cached(:virtualenv_path) { 'system_pyenv_root/versions/python_version/envs/cookbook_virtualenv' }
       cached(:aws_region) { 'us-iso-test' }
 
-      before do
-        allow_any_instance_of(String).to receive(:start_with?).with("us-iso").and_return(true)
-      end
-
-
       context "when cookbook virtualenv not installed yet" do
         cached(:chef_run) do
           runner = runner(platform: platform, version: version) do |node|
@@ -38,13 +33,18 @@
           expect(node.default['cluster']['cookbook_virtualenv_path']).to eq(virtualenv_path)
           is_expected.to write_node_attributes('dump node attributes')
         end
+        context "when in isolated region" do
+          before do
+            allow_any_instance_of(String).to receive(:start_with?).with("us-iso").and_return(true)
+          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/)
+          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