tests/run: use the current date as Message-ID in `sample_message`.

A random 128-bit UUID obtained from /proc/sys/kernel/random/uuid works
too but is Linux-specific and requires the proc(5) pseudo-filesystem to
be mounted at /proc.

1 files changed, 3 insertions, 2 deletions

diff --git a/tests/run b/tests/run
index 91319f3..fca4919 100755
--- a/tests/run
+++ b/tests/run
@@ -133,11 +133,12 @@ doveadm() {
 
 # Sample (random) message
 sample_message() {
+    local date="$(date +"%s.%N")"
     cat <<-EOF
 		From: <sender@example.net>
 		To: <recipient@example.net>
-		Date: $(date -R)
-		Message-ID: <$(< /proc/sys/kernel/random/uuid)@example.net>
+		Date: $(date -R -d@"$date")
+		Message-ID: <$date@example.net>
 
 	EOF
     local len="$(shuf -i1-4096 -n1)"