easement of necessity When one person transfers or bequeaths immovable property to another : (a) If an easement in another immovable property of the transfer or testator is necessary for enjoying the subject of the transferor or bequest.the transferee or legatee shall be entitled to such easement, or (b) if an easement in the subject of transfer or be quest is necessary for enjoying other immovable property of the transferor or testator, the transferor or the legal representative of the testator shall be entitled to such easement. Where a partition is made of the joint property of several persons, (c) If an easement over the share of one them is necessary for enjoying the share of another of them, the latter shall be entitled to such easement.