[Installer] Print message when skipping user project integration

CHANGELOG.md

@@ -36,6 +36,9 @@ To install release candidates run `[sudo] gem install cocoapods --pre`
   [Danielle Tomlinson](https://github.com/DanToml)
   [#5540](https://github.com/CocoaPods/CocoaPods/pulls/5540)
 
+* Print message when skipping user project integration.
+  [Danielle Tomlinson](https://github.com/dantoml)
+  [#5517](https://github.com/CocoaPods/CocoaPods/issues/5517)
 
 ##### Bug Fixes
 

lib/cocoapods/installer.rb

@@ -114,7 +114,11 @@ module Pod
       verify_no_static_framework_transitive_dependencies
       verify_framework_usage
       generate_pods_project
-      integrate_user_project if installation_options.integrate_targets?
+      if installation_options.integrate_targets?
+        integrate_user_project
+      else
+        UI.section 'Skipping User Project Integration'
+      end
       perform_post_install_actions
     end
 

spec/unit/installer_spec.rb

@@ -157,6 +157,7 @@ module Pod
         @installer.installation_options.integrate_targets = false
         @installer.expects(:integrate_user_project).never
         @installer.install!
+        UI.output.should.include 'Skipping User Project Integration'
       end
 
       it 'prints a list of deprecated pods' do