Add timestamp to events.

testing/btest/language/event-ts.zeek

@@ -0,0 +1,28 @@
+# @TEST-EXEC: zeek -b -r $TRACES/ticks-dns.pcap %INPUT > out
+# @TEST-EXEC: btest-diff out
+
+# Note: We use a PCAP with DNS queries only so that we have a single packet per
+# time step. Thus the run loop will be executed only once per time step.
+
+global runs = -1;
+
+event test(depth: count)
+	{
+	if ( depth == 0 )
+		return;
+
+	print fmt("[%D] Test %s was scheduled at %D", network_time(), depth, current_event_time());
+	event test(--depth);
+	}
+
+event new_connection(c: connection)
+	{
+	print fmt(">> Run %s (%D):", ++runs, network_time());
+	# Descend into recursion to enqueue events until we add an event that will
+	# be handled in the next run loop iteration, i.e. at a different timestamp
+	# than it was enqueued. Use four levels of recursion as every drain of the
+	# event queue handles two layers and the event queue is drained two times.
+	# First after processing a packet and second in the run loop. Finally, we
+	# expect an event so that network_time() > current_event_time().
+	event test(4);
+	}