Podfile stubs now include a dummy xcodeproj setting

spec/unit/installer/target_installer_spec.rb

@@ -6,11 +6,16 @@ describe Pod::Installer::TargetInstaller do
 
   before do
     platform = Pod::Platform.ios
+
     @target_definition = Pod::Podfile::TargetDefinition.new(:foo)
     @target_definition.platform = platform
-    @podfile = stub('podfile', :platform => platform,
+
+    @podfile = stub('podfile',
+      :platform                    => platform,
+      :xcodeproj                   => 'dummy.xcodeproj',
       :generate_bridge_support?    => false,
-                  :set_arc_compatibility_flag? => false)
+      :set_arc_compatibility_flag? => false
+    )
 
     @project = Pod::Project.new
     @project.main_group.groups.new('name' => 'Targets Support Files')