private List <XY> GetWallLocations(FacilityLayer layer)
{
return(layer.Where(IsFloor)
.SelectMany(y => layer.GetNeighbors(y.Location).Where(x => !IsFloor(x)))
.Select(z => z.Location)
.Distinct().ToList());
}
private void AssertWallCountIs(int expected)
{
Assert.AreEqual(expected, _layer.Where(IsWall).Count());
}