Write back resolved port to options.

server/server.go

@@ -274,6 +274,19 @@ func (s *Server) AcceptLoop() {
 	s.listener = l
 	s.mu.Unlock()
 
+	// Write resolved port back to options.
+	_, port, err := net.SplitHostPort(l.Addr().String())
+	if err != nil {
+		Fatalf("Error parsing server address (%s): %s", l.Addr().String(), e)
+		return
+	}
+	portNum, err := strconv.Atoi(port)
+	if err != nil {
+		Fatalf("Error parsing server address (%s): %s", l.Addr().String(), e)
+		return
+	}
+	s.opts.Port = portNum
+
 	tmpDelay := ACCEPT_MIN_SLEEP
 
 	for s.isRunning() {

test/port_test.go

@@ -33,4 +33,9 @@ func TestResolveRandomPort(t *testing.T) {
 	if portNum == server.RANDOM_PORT {
 		t.Fatalf("Expected server to choose a random port\nGot: %d", server.RANDOM_PORT)
 	}
+
+	if opts.Port != portNum {
+		t.Fatalf("Options port (%d) should have been overridden by chosen random port (%d)",
+			opts.Port, portNum)
+	}
 }