public void GivenABlockOfColouredPixels_AndPixelPositionInBlockGivrn_ThenAdjacentPixelsAreReturned()
{
_colourGridService = new GridService(4, _startIndexPosition);
var expectedColour = "red";
_colourGridService.FillRow(expectedColour, 1, 1, 2);
_colourGridService.FillRow(expectedColour, 2, 1, 2);
var adjecent = _colourGridService.GetAllAdjacentSameColourPixels(new PixelPosition {
X = 1, Y = 1
});
var grid = _colourGridService.GetGridContent();
var resultPixel = grid[1, 1];
Assert.That(resultPixel.Colour, Is.EqualTo(expectedColour));
var pixelPositions = adjecent as PixelPosition[] ?? adjecent.ToArray();
Assert.That(pixelPositions.Count(), Is.EqualTo(4));
Assert.That(pixelPositions.Any(p => p.X == 1 && p.Y == 1));
Assert.That(pixelPositions.Any(p => p.X == 2 && p.Y == 1));
Assert.That(pixelPositions.Any(p => p.X == 1 && p.Y == 2));
Assert.That(pixelPositions.Any(p => p.X == 2 && p.Y == 2));
}