後でIssueは投げるとして、データセット分けたくは無いので3変数でお茶を濁すことにしました

@Suite struct SomeTest { private static let dataSets: [(a: String, b: String, c: String)] = [ ("a", "b", "c"), ("d", "e", "f"), ] @Test(arguments: dataSets) func doSomethingABC(_ a: String, _ b: String, _ c: String) { } @Test(arguments: dataSets) func doSomethingAB(_ a: String, _ b: String, _: String) { } @Test(arguments: dataSets) func doSomethingAC(_ a: String, _: String, _ c: String) { } }

(edited)