Make git-cl tests work on Mac SnowLeopard

git_cl/test/rename.sh

 #!/bin/bash
 
 # Renaming a file should show up as a rename in the review.
 
 set -e
 
 . ./test-lib.sh
 
 setup_initsvn
 setup_gitsvn
 
 (
   set -e
   cd git-svn
   git config rietveld.server localhost:8080
 
   # Create a branch, rename a file, upload it.
   git checkout -q -b rename
   git mv test test2
   git commit -q -m "renamed"
-  export EDITOR=/bin/true
+  export EDITOR=$(which true)
   test_expect_success "upload succeeds" \
     "$GIT_CL upload -m test master... | grep -q 'Issue created'"
 
   # Look at the uploaded patch and verify it is a rename patch.
   echo "Rename test not fully implemented yet.  :("
   exit 1
 )
 
 SUCCESS=$?
 
 cleanup
 
 if [ $SUCCESS == 0 ]; then
   echo PASS
 fi