Testing a pure function

PureFunctionTest.kt

    "should detect won games" {
      winningMoves
        .map { games ->
          checkAll(games) { moves ->
            either {
                val game = Game.new().bind().make(moves).bind()
                moves.forEach { (coordinates, symbol) -> game.cell(coordinates) shouldBe symbol }
                val won = game.shouldBeTypeOf<Won>()
                won.winner shouldBe CROSS
              }
              .shouldBeRight()
          }
        }
        .shouldBeRight()
    }