Synchronize selected user access

client_notification_test.go

@@ -84,6 +84,21 @@ func TestServerAddressDefaultsPortWithoutBreakingIPv6(t *testing.T) {
 	}
 }
 
+func TestConcurrentSelectedUserAccess(t *testing.T) {
+	b := &Barnard{}
+	user := &gumble.User{Session: 1}
+	var wg sync.WaitGroup
+	for i := 0; i < 20; i++ {
+		wg.Add(1)
+		go func(user *gumble.User) {
+			defer wg.Done()
+			b.setSelectedUserValue(user)
+			_ = b.selectedUserValue()
+		}(user)
+	}
+	wg.Wait()
+}
+
 func TestConcurrentMutedChannelAccess(t *testing.T) {
 	b := &Barnard{MutedChannels: make(map[uint32]bool)}
 	var wg sync.WaitGroup