diff -r 28c9d67d88ab -r a75896bf5ccb tests/test-context.py
--- a/tests/test-context.py	Wed Jul 11 11:43:22 2018 -0400
+++ b/tests/test-context.py	Wed Jul 11 12:36:37 2018 -0400
@@ -77,7 +77,7 @@
 print(ctxb.status(ctxa))
 
 # test performing a diff on a memctx
-diffopts = diffutil.diffallopts(repo.ui, {'git': True})
+diffopts = diffutil.diffallopts(repo.ui, {b'git': True})
 for d in ctxb.diff(ctxa, opts=diffopts):
     printb(d, end=b'')