--- a/tests/test-patch-offset.t	Mon Jun 18 15:25:57 2018 +0530
+++ b/tests/test-patch-offset.t	Mon Jun 18 15:27:34 2018 +0530
@@ -8,7 +8,7 @@
   > fp = open(path, 'wb')
   > for pattern in patterns:
   >     count = int(pattern[0:-1])
-  >     char = pattern[-1] + '\n'
+  >     char = pattern[-1].encode('utf8') + b'\n'
   >     fp.write(char*count)
   > fp.close()
   > EOF