--- a/tests/logexceptions.py	Sun Feb 11 10:52:13 2018 -0800
+++ b/tests/logexceptions.py	Sun Feb 11 12:42:10 2018 -0800
@@ -65,6 +65,7 @@
             primaryframe,
             hgframe,
             hgline,
+            ui.environ[b'TESTNAME'].decode('utf-8', 'replace'),
         ]
         fh.write(b'\0'.join(p.encode('utf-8', 'replace') for p in parts))