public void TestThatBitmapManagerRemovesLayer()
{
BitmapManager bitmapManager = new BitmapManager
{
ActiveDocument = new Document(10, 10)
};
bitmapManager.AddNewLayer("_");
bitmapManager.AddNewLayer("_1");
Assert.Equal(2, bitmapManager.ActiveDocument.Layers.Count);
bitmapManager.RemoveLayer(0);
Assert.Single(bitmapManager.ActiveDocument.Layers);
}