fun <A, B, C>Gen.Companion.triple(genA:Gen<A>, genB:Gen<B>, genC:Gen<C>): Gen<Triple<A,B,C>> Deprecated: Deprecated and will be removed in 5.0. Migrate to the new property test classes in 4.0
Returns a [Gen] where each value is a [Triple] generated
by a value from each of three supplied generators.