Analisis jual beli tanah yang didahului dengan adanya hibah wasiat dan implikasinya terhadap perlindungan hukum pembeli beritikad baik: studi kasus putusan Mahkamah Agung no. 834 K/PDT/2014 = Analysis of sale and purchase of land preceded by the existence of a grant of will and its implication on the protection of a good faith purchaser: case study of supreme court decision No 834/K/PDT/2014