Don't do a redundant idempotence check if it's the same as the output check we just did.

Signed-off-by: Daira Hopwood <[email protected]>

Author: daira

tests/utils.py

@@ -36,6 +36,7 @@ def _check(this_input_content, which_check):
                                      (which_check, this_input_content, output_content, expected_content))
 
         _check(input_content, "output check failed")
-        _check(expected_content, "idempotence check failed")
+        if input_content != expected_content:
+            _check(expected_content, "idempotence check failed")
     finally:
         shutil.rmtree(tmpdirname)