public void WhenRemovingEntityThatDoesNotExistFromCell_ThenRemoveThrowsArgumentException()
{
var entity = new Entity();
var map = new TestMap(1, 1);
Assert.ThrowsException <ArgumentException>(() => map.Remove(0, 0, entity));
}
public void WhenRemovingEntityFromCell_ThenThatCellNoLongerContainsTheEntity()
{
var entity = new Entity();
var map = new TestMap(1, 1);
map.Add(0, 0, entity);
var preCount = map.GetCell(0, 0).Content.Entities.Count;
map.Remove(0, 0, entity);
var postCount = map.GetCell(0, 0).Content.Entities.Count;
Assert.AreEqual(1, preCount);
Assert.AreEqual(0, postCount);
}