test format-patch -s: make sure MIME content type is shown as needed

Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t4021-format-patch-signer-mime.sh

@@ -0,0 +1,42 @@
+#!/bin/sh
+
+test_description='format-patch -s should force MIME encoding as needed'
+
+. ./test-lib.sh
+
+test_expect_success setup '
+
+	>F &&
+	git add F &&
+	git commit -m initial &&
+	echo new line >F &&
+
+	test_tick &&
+	git commit -m "This adds some lines to F" F
+
+'
+
+test_expect_success 'format normally' '
+
+	git format-patch --stdout -1 >output &&
+	! grep Content-Type output
+
+'
+
+test_expect_success 'format with signoff without funny signer name' '
+
+	git format-patch -s --stdout -1 >output &&
+	! grep Content-Type output
+
+'
+
+test_expect_success 'format with non ASCII signer name' '
+
+	GIT_COMMITTER_NAME="$B$O$^$N(B $B$U$K$*$&(B" \
+	git format-patch -s --stdout -1 >output &&
+	grep Content-Type output
+
+'
+
+test_done
+