A petitioner for the probate of a testament under the provisions of Articles 2882 through 2888 may obtain leave of court ex parte for the taking of the deposition of any witness whose testimony otherwise would not be available. The provisions of Articles 1426, 1434 through 1436, 1443 through 1446, 1449, 1452, and 1469 through 1471, so far as applicable, shall govern the taking of such deposition.
La. C.P. § 2889