diff --git a/cmd/gowebdav/main_test.go b/cmd/gowebdav/main_test.go
new file mode 100644
index 0000000..c8e418a
--- /dev/null
+++ b/cmd/gowebdav/main_test.go
@@ -0,0 +1,78 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"testing"
+
+	"golang.org/x/net/webdav"
+)
+
+func basicAuth(h http.Handler) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		if user, passwd, ok := r.BasicAuth(); ok {
+			if user == "user" && passwd == "password" {
+				h.ServeHTTP(w, r)
+				return
+			}
+
+			http.Error(w, "not authorized", 403)
+		} else {
+			w.Header().Set("WWW-Authenticate", `Basic realm="x"`)
+			w.WriteHeader(401)
+		}
+	}
+}
+
+func newServer(t *testing.T) (*httptest.Server, webdav.FileSystem, context.Context) {
+	mux := http.NewServeMux()
+	fs := webdav.NewMemFS()
+	ctx := fillFs(t, fs)
+	mux.HandleFunc("/", basicAuth(&webdav.Handler{
+		FileSystem: fs,
+		LockSystem: webdav.NewMemLS(),
+	}))
+	srv := httptest.NewServer(mux)
+	os.Setenv("ROOT", srv.URL)
+	os.Setenv("USER", "user")
+	os.Setenv("PASSWORD", "password")
+	return srv, fs, ctx
+}
+
+func fillFs(t *testing.T, fs webdav.FileSystem) context.Context {
+	ctx := context.Background()
+	f, err := fs.OpenFile(ctx, "hello.txt", os.O_CREATE, 0644)
+	if err != nil {
+		t.Errorf("fail to crate file: %v", err)
+	}
+	f.Write([]byte("hello gowebdav\n"))
+	f.Close()
+	err = fs.Mkdir(ctx, "/test", 0755)
+	if err != nil {
+		t.Errorf("fail to crate directory: %v", err)
+	}
+	f, err = fs.OpenFile(ctx, "/test/test.txt", os.O_CREATE, 0644)
+	if err != nil {
+		t.Errorf("fail to crate file: %v", err)
+	}
+	f.Write([]byte("test test gowebdav\n"))
+	f.Close()
+	return ctx
+}
+
+func TestLs(t *testing.T) {
+	oldArgs := os.Args
+	defer func() { os.Args = oldArgs }()
+
+	srv, _, _ := newServer(t)
+
+	defer srv.Close()
+
+	flag.CommandLine = flag.NewFlagSet("ls", flag.ExitOnError)
+
+	os.Args = []string{"ls", "-X", "ls", "/"}
+	main()
+}