chore: git cache cleanup

backend/internal/services/backup_service_disk_test.go

@@ -0,0 +1,35 @@
+package services
+
+import (
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestBackupService_GetAvailableSpace(t *testing.T) {
+	t.Parallel()
+
+	t.Run("returns space for existing directory", func(t *testing.T) {
+		t.Parallel()
+
+		tmpDir := t.TempDir()
+		svc := &BackupService{BackupDir: tmpDir}
+
+		space, err := svc.GetAvailableSpace()
+		require.NoError(t, err)
+		assert.Greater(t, space, int64(0))
+	})
+
+	t.Run("errors for missing directory", func(t *testing.T) {
+		t.Parallel()
+
+		tmpDir := t.TempDir()
+		missingDir := filepath.Join(tmpDir, "does-not-exist")
+		svc := &BackupService{BackupDir: missingDir}
+
+		_, err := svc.GetAvailableSpace()
+		require.Error(t, err)
+	})
+}