Move NATS testing code to separate module.

nats/loopback.go

@@ -60,6 +60,13 @@ func NewLoopbackClient(logger log.Logger) (Client, error) {
 	return client, nil
 }
 
+func (c *LoopbackClient) SubscriptionCount() int {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	return len(c.subscriptions)
+}
+
 func (c *LoopbackClient) processMessages() {
 	defer close(c.closed)
 

nats/native_test.go

@@ -31,12 +31,31 @@ import (
 	"github.com/stretchr/testify/require"
 
 	"github.com/nats-io/nats-server/v2/server"
+	natsservertest "github.com/nats-io/nats-server/v2/test"
 	"github.com/nats-io/nats.go"
 
 	"github.com/strukturag/nextcloud-spreed-signaling/log"
 	"github.com/strukturag/nextcloud-spreed-signaling/test"
 )
 
+func StartLocalServer(t *testing.T) (*server.Server, int) {
+	t.Helper()
+	return StartLocalServerPort(t, server.RANDOM_PORT)
+}
+
+func StartLocalServerPort(t *testing.T, port int) (*server.Server, int) {
+	t.Helper()
+	opts := natsservertest.DefaultTestOptions
+	opts.Port = port
+	opts.Cluster.Name = "testing"
+	srv := natsservertest.RunServer(&opts)
+	t.Cleanup(func() {
+		srv.Shutdown()
+		srv.WaitForShutdown()
+	})
+	return srv, opts.Port
+}
+
 func CreateLocalClientForTest(t *testing.T, options ...nats.Option) (*server.Server, int, Client) {
 	t.Helper()
 	server, port := StartLocalServer(t)

nats/test/server.go

@@ -19,7 +19,7 @@
  * 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/>.
  */
-package nats
+package test
 
 import (
 	"context"
@@ -29,6 +29,8 @@ import (
 	"github.com/nats-io/nats-server/v2/server"
 	"github.com/nats-io/nats-server/v2/test"
 	"github.com/stretchr/testify/assert"
+
+	"github.com/strukturag/nextcloud-spreed-signaling/nats"
 )
 
 func StartLocalServer(t *testing.T) (*server.Server, int) {
@@ -49,22 +51,18 @@ func StartLocalServerPort(t *testing.T, port int) (*server.Server, int) {
 	return srv, opts.Port
 }
 
-func WaitForSubscriptionsEmpty(ctx context.Context, t *testing.T, client Client) {
+func WaitForSubscriptionsEmpty(ctx context.Context, t *testing.T, client nats.Client) {
 	t.Helper()
-	if c, ok := client.(*LoopbackClient); assert.True(t, ok, "expected LoopbackNatsClient, got %T", client) {
+	if c, ok := client.(*nats.LoopbackClient); assert.True(t, ok, "expected LoopbackNatsClient, got %T", client) {
 		for {
-			c.mu.Lock()
-			count := len(c.subscriptions)
-			c.mu.Unlock()
-			if count == 0 {
+			remaining := c.SubscriptionCount()
+			if remaining == 0 {
 				break
 			}
 
 			select {
 			case <-ctx.Done():
-				c.mu.Lock()
-				assert.NoError(t, ctx.Err(), "Error waiting for subscriptions %+v to terminate", c.subscriptions)
-				c.mu.Unlock()
+				assert.NoError(t, ctx.Err(), "Error waiting for %d subscriptions to terminate", remaining)
 				return
 			default:
 				time.Sleep(time.Millisecond)

nats/test/server_test.go

@@ -0,0 +1,87 @@
+/**
+ * Standalone signaling server for the Nextcloud Spreed app.
+ * Copyright (C) 2026 struktur AG
+ *
+ * @author Joachim Bauch <bauch@struktur.de>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * 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/>.
+ */
+package test
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/strukturag/nextcloud-spreed-signaling/log"
+	"github.com/strukturag/nextcloud-spreed-signaling/nats"
+)
+
+func TestLocalServer(t *testing.T) {
+	t.Parallel()
+
+	require := require.New(t)
+	assert := assert.New(t)
+
+	server, port := StartLocalServer(t)
+	assert.NotEqual(0, port)
+
+	ctx := log.NewLoggerContext(t.Context(), log.NewLoggerForTest(t))
+
+	client, err := nats.NewClient(ctx, server.ClientURL())
+	require.NoError(err)
+
+	assert.NoError(client.Close(context.Background()))
+}
+
+func TestWaitForSubscriptionsEmpty(t *testing.T) {
+	t.Parallel()
+
+	require := require.New(t)
+	assert := assert.New(t)
+
+	ctx := log.NewLoggerContext(t.Context(), log.NewLoggerForTest(t))
+
+	client, err := nats.NewClient(ctx, nats.LoopbackUrl)
+	require.NoError(err)
+	defer func() {
+		assert.NoError(client.Close(context.Background()))
+	}()
+
+	ch := make(chan *nats.Msg)
+	sub, err := client.Subscribe("foo", ch)
+	require.NoError(err)
+
+	ready := make(chan struct{})
+	done := make(chan struct{})
+	go func() {
+		defer close(done)
+
+		ctx, cancel := context.WithTimeout(t.Context(), time.Second)
+		defer cancel()
+
+		close(ready)
+		WaitForSubscriptionsEmpty(ctx, t, client)
+	}()
+
+	<-ready
+
+	require.NoError(sub.Unsubscribe())
+	<-done
+}