t.Errorf("%s: expect %v %v %v got %v %v %v", tt.desc, tt.wantK, tt.wantV, tt.wantErr, k, v, err)
			}
		})
	}
}

func TestPathV(t *testing.T) {
	tests := []struct {
		desc string
		in   string
		want string
		err  error
	}{
		{
			desc: "valid-kv",
			in:   "[1:2]",
			want: "1:2",
			err:  nil,
		},
		{