For example contestation, controversy etc. (See Merriam Webster dictionary)

In democratic government, they are not to be found, since the purpose of an election is to explicitly allow partisan contestation for control of the government.

This research focuses on Belarus, a former Soviet republic that elected its first president, Alexander Lukashenko, in 1994.

Martin Blais has written:

'Philosophie du pouvoir' -- subject(s): Pouvoir (Morale)

'L' autre Thomas d'Aquin'

'Participation et contestation'

If the terms of the will were agreed to then it cannot be contested. If there was not such an agreement then the will may be subject to contestation. Please be advised, such action is usually very expensive and very lengthy.