1 files changed, 22 insertions(+), 0 deletions(-)

M message/header.ha

@@ 433,6 433,28 @@ export fn write_header(sink: io::handle, head: *header) (size | io::error) = {
 	assert(result == expect);
 };
 
+@test fn roundtrip() void = {
+	const input =
+		"To: Drew DeVault <sir@cmpwn.com>\r\n"
+		"From: Harriet <harriet@harelang.org>\r\n"
+		"Content-Type: text/plain\r\n"
+		"DKIM-Signature: a=rsa-sha256;\r\n"
+		" bh=uI/rVH7mLBSWkJVvQYKz3TbpdI2BLZWTIMKcuo0KHOI=; c=simple/simple;\r\n"
+		" d=example.org; h=Subject:To:From; s=default; t=1577562184; v=1; b=;\r\n"
+		"\r\n";
+
+	const in = bufio::fixed(strings::toutf8(input), io::mode::READ);
+	const head = read_header(&in)!;
+	defer header_finish(&head);
+
+	const sink = strio::dynamic();
+	defer io::close(&sink)!;
+
+	write_header(&sink, &head)!;
+
+	assert(strio::string(&sink) == input);
+};
+
 // Initializes a new header field, duplicating the provided parameters.
 fn new_header_field(key: str, val: str, raw: []u8) header_field = {
 	return header_field {