added unit test for this

libs/filer/local_client_test.go

@@ -0,0 +1,29 @@
+package filer
+
+import (
+	"context"
+	"path/filepath"
+	"runtime"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestLocalClientAtRootForWindows(t *testing.T) {
+	if runtime.GOOS != "windows" {
+		t.Skip("this test is only meant for windows")
+	}
+	tmpDir := t.TempDir()
+	ctx := context.Background()
+
+	// create filer root at "root"
+	f, err := NewLocalClient("/")
+	require.NoError(t, err)
+
+	// Assert stat call to the temp dir succeeds.
+	info, err := f.Stat(ctx, tmpDir)
+	assert.NoError(t, err)
+	assert.Equal(t, filepath.Base(tmpDir), info.Name())
+	assert.True(t, info.IsDir())
+}