t5550: test display of remote http error messages

Since commit 426e70d (remote-curl: show server content on
http errors, 2013-04-05), we relay any text/plain error
messages from the remote server to the user. However, we
never tested it.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/lib-httpd/error.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+printf "Status: 500 Intentional Breakage\n"
+
+printf "Content-Type: "
+case "$PATH_INFO" in
+*html*)
+	printf "text/html"
+	;;
+*text*)
+	printf "text/plain"
+	;;
+esac
+printf "\n"
+
+printf "\n"
+printf "this is the error message\n"