Fix cmdtest so that fail-tests work

1 files changed, 2 insertions, 1 deletions

diff --git a/cmdtest b/cmdtest
index 581b07a..b8c6efa 100755
--- a/cmdtest
+++ b/cmdtest
@@ -209,7 +209,8 @@ class CommandTester(cliapp.Application):
         argv = ['diff', '-u', expected_name, actual_name]
         with open(diff_name, 'w') as f:
             exit, out, err = self.runcmd_unchecked(argv, stdout=f)
-        return out
+        with open(diff_name, 'r') as f:
+            return f.read()
 
     def report_timings(self):