public void ShouldMarkCellsWithShip()
{
var shipPlacement = _fixture.Create <ShipPlacement>();
var shipPositions = _fixture.CreateMany <(char, int)>().ToList();
_battleshipPlacement.Setup(x => x.GetShipPositions(shipPlacement))
.Returns(shipPositions);
_battleship.Place(_battlefield.Object, shipPlacement);
foreach (var positions in shipPositions)
{
_battlefield.Verify(x => x.MarkCell(positions), Times.Once);
}
_battlefield.Verify(x => x.MarkCell(It.IsAny <(char, int)>()), Times.Exactly(shipPositions.Count));
}