public void Should_Add_And_Iterate_Over_Context_Values()
{
var ctx = new RenderContext();
ctx.AddSprite(RenderContext.BackgroundLayerKey, GetRandomSpriteContext());
ctx.AddSprite(RenderContext.BackgroundLayerKey, GetRandomSpriteContext());
ctx.AddSprite(RenderContext.ForegroundLayerKey, GetRandomSpriteContext());
ctx.AddSprite(RenderContext.ForegroundLayerKey, GetRandomSpriteContext());
ctx.AddSprite(RenderContext.ForegroundLayerKey, GetRandomSpriteContext());
Assert.True(ctx.Count() == 2);
Assert.True(ctx[RenderContext.BackgroundLayerKey].Count() == 2);
Assert.True(ctx[RenderContext.ForegroundLayerKey].Count() == 3);
}