diff --git a/tests/test-patchbomb b/tests/test-patchbomb
--- a/tests/test-patchbomb
+++ b/tests/test-patchbomb
@@ -45,26 +45,26 @@ hg email --date '1970-1-1 0:3' -n -f quu
     fixheaders
 
 echo % utf-8 patch
-python -c 'fp = open("utf", "w"); fp.write("h\xC3\xB6mma!\n"); fp.close();'
+python -c 'fp = open("utf", "wb"); fp.write("h\xC3\xB6mma!\n"); fp.close();'
 hg commit -A -d '4 0' -m 'charset=utf-8; content-transfer-encoding: base64'
 
 echo % no mime encoding for email --test
-hg email --date '1970-1-1 0:4' -f quux -t foo -r tip -n | fixheaders > mailtest
+hg email --date '1970-1-1 0:4' -f quux -t foo -c bar -r tip -n | fixheaders > mailtest
 echo % md5sum of 8-bit output
 $TESTDIR/md5sum.py mailtest
 rm mailtest
 
 echo % mime encoded mbox
-hg email --date '1970-1-1 0:4' -f quux -t foo -r tip -m mbox
+hg email --date '1970-1-1 0:4' -f quux -t foo -c bar -r tip -m mbox
 cat mbox | fixheaders
 rm mbox
 
 echo % iso-8859-1 patch
-python -c 'fp = open("isolatin", "w"); fp.write("h\xF6mma!\n"); fp.close();'
+python -c 'fp = open("isolatin", "wb"); fp.write("h\xF6mma!\n"); fp.close();'
 hg commit -A -d '5 0' -m 'charset=us-ascii; content-transfer-encoding: 8bit'
 
 echo % fake ascii mbox
-hg email --date '1970-1-1 0:5' -f quux -t foo -r tip -m mbox
+hg email --date '1970-1-1 0:5' -f quux -t foo -c bar -r tip -m mbox
 fixheaders < mbox > mboxfix
 echo % md5sum of 8-bit output
 $TESTDIR/md5sum.py mboxfix
diff --git a/tests/test-patchbomb.out b/tests/test-patchbomb.out
--- a/tests/test-patchbomb.out
+++ b/tests/test-patchbomb.out
@@ -150,7 +150,7 @@ adding description
 adding utf
 % no mime encoding for email --test
 % md5sum of 8-bit output
-a6a3c6b9b6009cea23871a7727a282ab  mailtest
+ad877786716d09fd7843cf0ed5e3d2a8  mailtest
 % mime encoded mbox
 This patch series consists of 1 patches.
 
@@ -166,6 +166,7 @@ Message-Id: <c3c9e37db9f4fe4882cd.240@
 Date: Thu, 01 Jan 1970 00:04:00 +0000
 From: quux
 To: foo
+Cc: bar
 
 IyBIRyBjaGFuZ2VzZXQgcGF0Y2gKIyBVc2VyIHRlc3QKIyBEYXRlIDQgMAojIE5vZGUgSUQgYzNj
 OWUzN2RiOWY0ZmU0ODgyY2RhMzliYWY0MmZlZDZiYWQ4YjE1YQojIFBhcmVudCAgZmYyYzlmYTIw
@@ -187,4 +188,4 @@ This patch series consists of 1 patches.
 
 Writing [PATCH] charset=us-ascii; content-transfer-encoding: 8bit ...
 % md5sum of 8-bit output
-45cb4b77e02f39eb91955f5c95913d66  mboxfix
+90fae277a4a85255e8262174fcefb59f  mboxfix