With svn-git, how can I see what is about to be committed with git svn dcommit?

Here are the commands I run:

git svn  clone file:///svn/test1 test1-git
cd test1-git
echo "first line" > test1.txt 
git add test1.txt 
git commit

Now it's committed to the git repository -- good. But before I run git svn dcommit I'd like to see a diff that contains the changes that would be committed to the SVN repository.

git svn git-svn
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