Add some tests to ensure that 'cherry-pick -s' operates in the following
manner:
* Inserts a blank line before appending a s-o-b to a commit message that
does not contain a s-o-b footer
* Does not mistake first line "subject: description" as a s-o-b footer
* Does not mistake single word message body as conforming to rfc2822
* Appends a s-o-b when last s-o-b in footer does not match committer
s-o-b, even when committer's s-o-b exists elsewhere in footer.
* Does not append a s-o-b when last s-o-b matches committer s-o-b
* Correctly detects a non-conforming footer containing a mix of s-o-b
like elements and s-o-b elements. (marked "expect failure")
Signed-off-by: Brandon Casey <bcasey@nvidia.com>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>