func TestFileServerNotDirError(t *testing.T) {
	run(t, func(t *testing.T, mode testMode) {
		t.Run("Dir", func(t *testing.T) {
			testFileServerNotDirError(t, mode, func(path string) FileSystem { return Dir(path) })
		})
		t.Run("FS", func(t *testing.T) {
			testFileServerNotDirError(t, mode, func(path string) FileSystem { return FS(os.DirFS(path)) })
		})
	})