add features

backend/servermanager_test.go

@@ -1,6 +1,33 @@
 package backend
 
-import "testing"
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestServerManagerFilePasswordFallback(t *testing.T) {
+	configDir := t.TempDir()
+	manager := NewServerManager("supersonic-test", "test", DefaultConfig("test"), configDir, true, false)
+	server := manager.AddServer("Test", ServerConnection{})
+
+	if err := manager.SetServerPassword(server, "secret"); err != nil {
+		t.Fatalf("SetServerPassword: %v", err)
+	}
+	if got, err := manager.GetServerPassword(server.ID); err != nil || got != "secret" {
+		t.Fatalf("GetServerPassword = %q, %v; want secret, nil", got, err)
+	}
+	if info, err := os.Stat(filepath.Join(configDir, "credentials.json")); err != nil {
+		t.Fatalf("stat credential file: %v", err)
+	} else if got := info.Mode().Perm(); got != 0o600 {
+		t.Fatalf("credential file permissions = %o; want 600", got)
+	}
+
+	manager.DeleteServer(server.ID)
+	if _, err := manager.GetServerPassword(server.ID); err == nil {
+		t.Fatal("GetServerPassword succeeded after server deletion")
+	}
+}
 
 func TestNormalizeServerURL(t *testing.T) {
 	tests := []struct {