testacy

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The condition of having left a valid will.

from The Century Dictionary.

• noun In law. the state of being testate, or of leaving a valid testament or will at death.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Law) The state or circumstance of being testate, or of leaving a valid will, or testament, at death.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The condition of being testate; of having left a valid will at one's death.