Synchronize muted channel state

client_notification_test.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"io"
 	"strings"
+	"sync"
 	"testing"
 	"time"
 	"unicode/utf8"
@@ -83,6 +84,20 @@ func TestServerAddressDefaultsPortWithoutBreakingIPv6(t *testing.T) {
 	}
 }
 
+func TestConcurrentMutedChannelAccess(t *testing.T) {
+	b := &Barnard{MutedChannels: make(map[uint32]bool)}
+	var wg sync.WaitGroup
+	for i := 0; i < 20; i++ {
+		wg.Add(1)
+		go func(i int) {
+			defer wg.Done()
+			b.setChannelMuted(uint32(i%3), i%2 == 0)
+			_ = b.isChannelMuted(uint32((i + 1) % 3))
+		}(i)
+	}
+	wg.Wait()
+}
+
 func TestPublicTextMessageTargetsChannelIDsAndTrees(t *testing.T) {
 	root := &gumble.Channel{ID: 1, Name: "Root"}
 	current := &gumble.Channel{ID: 2, Name: "Room", Parent: root}