[XCConfigIntegrator] Add spec for re-integrating when old config was in the CocoaPods sandbox

lib/cocoapods/installer/user_project_integrator/target_integrator/xcconfig_integrator.rb

@@ -79,9 +79,14 @@ module Pod
             file_ref = group.files.find { |f| f.path == path }
             existing = config.base_configuration_reference
 
+            set_base_configuration_reference = ->() do
+              file_ref ||= group.new_file(path)
+              config.base_configuration_reference = file_ref
+            end
+
             if existing && existing != file_ref
               if existing.real_path.to_path.start_with?(pod_bundle.support_files_dir.to_path)
-                existing.path = path
+                set_base_configuration_reference.call
               elsif !xcconfig_includes_target_xcconfig?(config.base_configuration_reference, path)
                 UI.warn 'CocoaPods did not set the base configuration of your ' \
                 'project because your project already has a custom ' \
@@ -91,8 +96,7 @@ module Pod
                 'build configuration.'
               end
             elsif config.base_configuration_reference.nil? || file_ref.nil?
-              file_ref ||= group.new_file(path)
-              config.base_configuration_reference = file_ref
+              set_base_configuration_reference.call
             end
           end
 

spec/unit/installer/user_project_integrator/target_integrator/xcconfig_integrator_spec.rb

@@ -5,7 +5,7 @@ module Pod
     before do
       project_path = SpecHelper.create_sample_app_copy_from_fixture('SampleProject')
       @project = Xcodeproj::Project.open(project_path)
-      Xcodeproj::Project.new(config.sandbox.project_path).save
+      Project.new(config.sandbox.project_path).save
       @target = @project.targets.first
       target_definition = Podfile::TargetDefinition.new('Pods', nil)
       target_definition.link_with_first_target = true
@@ -105,5 +105,20 @@ module Pod
 
       UI.warnings.should.not.match /not set.*base configuration/
     end
+
+    it 'handles when xcconfig is set to another sandox xcconfig' do
+      group = @project.new_group('Pods')
+      old_config = group.new_file('../Pods/Target Support Files/Pods/SampleConfig.xcconfig')
+      @target.build_configurations.each do |config|
+        config.base_configuration_reference = old_config
+      end
+      XCConfigIntegrator.integrate(@pod_bundle, [@target])
+      @target.build_configurations.each do |config|
+        config.base_configuration_reference.should.not == old_config
+        config.base_configuration_reference.path.should == @pod_bundle.xcconfig_relative_path(config.name)
+      end
+
+      UI.warnings.should.be.empty
+    end
   end
 end