Make git-cl tests work on Mac SnowLeopard

git_cl/test/upload-local-tracking-branch.sh

 #!/bin/bash
 
 set -e
 
 . ./test-lib.sh
 
 setup_initgit
 setup_gitgit
 
 (
   set -e
   cd git-git
   git checkout -q -b work HEAD^
   git checkout -q -t -b work2 work
   echo "some work done on a branch that tracks a local branch" >> test
   git add test; git commit -q -m "local tracking branch work"
 
   git config rietveld.server localhost:8080
 
   # Prevent the editor from coming up when you upload.
-  export EDITOR=/bin/true
+  export EDITOR=$(which true)
   test_expect_success "upload succeeds (needs a server running on localhost)" \
     "$GIT_CL upload -m test | grep -q 'Issue created'"
 )
 SUCCESS=$?
 
 cleanup
 
 if [ $SUCCESS == 0 ]; then
   echo PASS
 fi