diff --git a/plugins/OStatus/tests/slap.php b/plugins/OStatus/tests/slap.php
new file mode 100644
index 0000000000..b5f9d3e073
--- /dev/null
+++ b/plugins/OStatus/tests/slap.php
@@ -0,0 +1,92 @@
+#!/usr/bin/env php
+<?php
+/*
+ * StatusNet - a distributed open-source microblogging tool
+ * Copyright (C) 2010, StatusNet, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+define('INSTALLDIR', realpath(dirname(__FILE__) . '/../../..'));
+
+$longoptions = array('verify', 'slap=', 'notice=');
+
+$helptext = <<<END_OF_HELP
+slap.php [options]
+
+Test generation and sending of magic envelopes for Salmon slaps.
+
+     --notice=N   generate entry for this notice number
+     --verify     send signed magic envelope to Tuomas Koski's test service
+     --slap=<url> send signed Salmon slap to the destination endpoint
+
+
+END_OF_HELP;
+
+require_once INSTALLDIR.'/scripts/commandline.inc';
+
+if (!have_option('--notice')) {
+    print "$helptext";
+    exit(1);
+}
+
+$notice_id = get_option_value('--notice');
+
+$notice = Notice::staticGet('id', $notice_id);
+$profile = $notice->getProfile();
+$entry = $notice->asAtomEntry(true);
+
+echo "== Original entry ==\n\n";
+print $entry;
+print "\n\n";
+
+$salmon = new Salmon();
+$envelope = $salmon->createMagicEnv($entry, $profile);
+
+echo "== Signed envelope ==\n\n";
+print $envelope;
+print "\n\n";
+
+echo "== Testing local verification ==\n\n";
+$ok = $salmon->verifyMagicEnv($envelope);
+if ($ok) {
+    print "OK\n\n";
+} else {
+    print "FAIL\n\n";
+}
+
+if (have_option('--verify')) {
+    $url = 'http://www.madebymonsieur.com/ostatus_discovery/magic_env/validate/';
+    echo "== Testing remote verification ==\n\n";
+    print "Sending for verification to $url ...\n";
+
+    $client = new HTTPClient();
+    $response = $client->post($url, array(), array('magic_env' => $envelope));
+
+    print $response->getStatus() . "\n\n";
+    print $response->getBody() . "\n\n";
+}
+
+if (have_option('--slap')) {
+    $url = get_option_value('--slap');
+    echo "== Remote salmon slap ==\n\n";
+    print "Sending signed Salmon slap to $url ...\n";
+
+    $ok = $salmon->post($url, $entry, $profile);
+    if ($ok) {
+        print "OK\n\n";
+    } else {
+        print "FAIL\n\n";
+    }
+}