new file mode 100755
--- /dev/null
+++ b/tests/test-patchbomb
@@ -0,0 +1,17 @@
+#!/bin/sh
+
+echo "[extensions]" >> $HGRCPATH
+echo "patchbomb=" >> $HGRCPATH
+
+hg init
+echo a > a
+hg commit -Ama -d '1 0'
+
+hg email --date '1970-1-1 0:1' -n -f quux -t foo -c bar tip | \
+  sed -e 's/\(Message-Id:.*@\).*/\1/'
+
+echo b > b
+hg commit -Amb -d '2 0'
+
+hg email --date '1970-1-1 0:2' -n -f quux -t foo -c bar -s test 0:tip | \
+  sed -e 's/\(Message-Id:.*@\|In-Reply-To:.*@\).*/\1/'