What is the test for mootness in an administrative law case?

Canada (Federal), Canada

The following excerpt is from Gratton v. Canada (Attorney General), 1999 CanLII 7487 (FC):

I shall consider first the arguments that the issue in this proceeding is now moot. Although articulated in the context of a constitutional challenge, the principles governing mootness established in Borowski v. Canada (Attorney General) 1989 CanLII 123 (SCC), [1989] 1 S.C.R. 342 are equally applicable to challenges to the exercise of public power made on administrative law grounds.

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