chore: import upstream snapshot with attribution

server/router/api/v1/instance_stats_test.go

@@ -0,0 +1,34 @@
+package v1
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestWalkLocalStorage_SumsFileSizes(t *testing.T) {
+	dir := t.TempDir()
+	require.NoError(t, os.WriteFile(filepath.Join(dir, "a.txt"), []byte("hello"), 0o600))  // 5
+	require.NoError(t, os.WriteFile(filepath.Join(dir, "b.txt"), []byte("world!"), 0o600)) // 6
+	sub := filepath.Join(dir, "sub")
+	require.NoError(t, os.Mkdir(sub, 0o700))
+	require.NoError(t, os.WriteFile(filepath.Join(sub, "c.txt"), []byte("xx"), 0o600)) // 2
+
+	size, err := walkLocalStorage(dir)
+	require.NoError(t, err)
+	require.Equal(t, int64(13), size)
+}
+
+func TestWalkLocalStorage_EmptyDir(t *testing.T) {
+	size, err := walkLocalStorage("")
+	require.Error(t, err)
+	require.Equal(t, int64(-1), size)
+}
+
+func TestWalkLocalStorage_NonexistentDir(t *testing.T) {
+	size, err := walkLocalStorage(filepath.Join(t.TempDir(), "does-not-exist"))
+	require.Error(t, err)
+	require.Equal(t, int64(-1), size)
+}