This extension method can only be called inside of the assertTrue
method.
This extension method can only be called inside of the assertTrue
method. It will transform the value using the given TestLens.
val option: Either[Int, Option[String]] = Right(Some("Cool")) assertTrue(option.is(_.right.some) == "Cool") // returns true assertTrue(option.is(_.left) < 100) // will fail because of `.left`.