Add some more detail to assert error message.
-rw-r--r-- 6 .gitignore
-rw-r--r-- 1120 PRESUBMIT.py
-rw-r--r-- 463 WATCHLISTS
-rw-r--r-- 9970 buildspec_to_git.py
-rw-r--r-- 240 codereview.settings
-rwxr-xr-x 15535 deps2git.py
-rw-r--r-- 6032 deps2submodules.py
-rwxr-xr-x 2847 deps2submodules_unittest.py
-rw-r--r-- 7418 deps_utils.py
-rwxr-xr-x 10558 git_tools.py
-rwxr-xr-x 7223 svn_to_git_public.py
-rwxr-xr-x 839 svn_to_git_public_unittest.py