Implemented integration test for update_selected

cocoapods-integration-specs @ f6f33b7a

-Subproject commit ae27aac45afea07e94790947988933fbb9291a22
+Subproject commit f6f33b7af957956ca644b620f4815265f75c9389

spec/integration.rb

@@ -373,6 +373,10 @@ describe "Integration" do
       check "update --no-repo-update", "update_all"
     end
 
+    describe "Updates a selected Pod in an existing installation" do
+      check "update Reachability --no-repo-update", "update_selected"
+    end
+
   end
 
   #--------------------------------------#