public void Grid_GetValidColours_ReturnsArrayOfValidColours()
{
/*
* RED
* BLUE CELL (1,1) YELLOW
* GREEN
*/
var grid = new Grid(3);
grid.SetCell(new Cell(ColourEnum.None, ColourEnum.None, ColourEnum.Blue, ColourEnum.None), 0, 1); // l
grid.SetCell(new Cell(ColourEnum.None, ColourEnum.None, ColourEnum.None, ColourEnum.Red), 1, 2); // t
grid.SetCell(new Cell(ColourEnum.Yellow, ColourEnum.None, ColourEnum.None, ColourEnum.None), 2, 1); // r
grid.SetCell(new Cell(ColourEnum.None, ColourEnum.Green, ColourEnum.None, ColourEnum.None), 1, 0); // b
var result = grid.GetValidColours(1, 1);
Assert.IsTrue(result.SequenceEqual(new List<ColourEnum> { ColourEnum.Blue, ColourEnum.Red, ColourEnum.Yellow, ColourEnum.Green }));
}