Gerry Foley wrote "The Test of Ireland" in 1973. It is available here. The document was part of an international defense of the Leninist strategy of party-building taking place in the Fourth International. Foley was part of the Leninist-Trotskyist Faction, along with other international leaders, including the U.S. Socialist Workers Party. Central documents in this struggle are available in Joseph Hansen's book, as well as here and here.
Below are some excerpts from Foley's report. It bears rereading in its entirety.