Fixes in codegen and test script

test/test.sh

Index: test/test.sh
diff --git a/test/test.sh b/test/test.sh
index c96a72ec69e30cabf6c4ada27fa1105c1cad33ca..cc3bfc5bf66f0bcb82417747a8a266030d2db223 100755
--- a/test/test.sh
+++ b/test/test.sh
@@ -26,7 +26,7 @@ function show_diff {
     sed -e "s/^\(-.*\)/\1/"
   echo
   echo "You can update these expectations with:"
-  echo "$ pushd `pwd` && cp -a actual/* expect && popd"
+  echo "$ cp -a test/codegen/actual/* test/codegen/expect"

[Jennifer Messerly, 2015/03/11 23:48:00]

This doesn't work if you're standing in a folder besides root. This script is
meant to work from anywhere, hence changed on purpose in a past revision to use
`pwd`. I'm fine with interpolating the `pwd` here if you want to avoid
pushd/popd.

[Siggi Cherem (dart-lang), 2015/03/12 00:16:26]

Ah, I see, never mind, I somehow missed that. reverted

   fail
 }