test_cmp expect actual
'
+test_expect_success '--from=ident notices bogus ident' '
+ test_must_fail git format-patch -1 --stdout --from=foo >patch
+'
+
+test_expect_success '--from=ident replaces author' '
+ git format-patch -1 --stdout --from="Me <me@example.com>" >patch &&
+ cat >expect <<-\EOF &&
+ From: Me <me@example.com>
+
+ From: A U Thor <author@example.com>
+
+ EOF
+ sed -ne "/^From:/p; /^$/p; /^---$/q" <patch >patch.head &&
+ test_cmp expect patch.head
+'
+
+test_expect_success '--from uses committer ident' '
+ git format-patch -1 --stdout --from >patch &&
+ cat >expect <<-\EOF &&
+ From: C O Mitter <committer@example.com>
+
+ From: A U Thor <author@example.com>
+
+ EOF
+ sed -ne "/^From:/p; /^$/p; /^---$/q" <patch >patch.head &&
+ test_cmp expect patch.head
+'
+
+test_expect_success '--from omits redundant in-body header' '
+ git format-patch -1 --stdout --from="A U Thor <author@example.com>" >patch &&
+ cat >expect <<-\EOF &&
+ From: A U Thor <author@example.com>
+
+ EOF
+ sed -ne "/^From:/p; /^$/p; /^---$/q" <patch >patch.head &&
+ test_cmp expect patch.head
+'
+
+test_expect_success 'in-body headers trigger content encoding' '
+ GIT_AUTHOR_NAME="éxötìc" test_commit exotic &&
+ test_when_finished "git reset --hard HEAD^" &&
+ git format-patch -1 --stdout --from >patch &&
+ cat >expect <<-\EOF &&
+ From: C O Mitter <committer@example.com>
+ Content-Type: text/plain; charset=UTF-8
+
+ From: éxötìc <author@example.com>
+
+ EOF
+ sed -ne "/^From:/p; /^$/p; /^Content-Type/p; /^---$/q" <patch >patch.head &&
+ test_cmp expect patch.head
+'
+
append_signoff()
{
C=$(git commit-tree HEAD^^{tree} -p HEAD) &&