test_file msg_13.txt msg_13-1.txt -B '*/*'
test_file msg_13.txt msg_13.txt -t 'text/*' -b 'image/*' -B '*/*'
test_file msg_36.txt msg_36-1.txt -i multipart/alternative
test_file msg_13.txt msg_13-1.txt -B '*/*'
test_file msg_13.txt msg_13.txt -t 'text/*' -b 'image/*' -B '*/*'
test_file msg_36.txt msg_36-1.txt -i multipart/alternative