public void TestsClearingCell()
        {
            const int columnIndex = 2;
            const int rowIndex    = 2;
            const int assetIndex  = 0;

            var cell = new HexagonMap.Cell()
            {
                columnIndex = 2,
                rowIndex    = 2,
                assetIndex  = -1,
                cellType    = HexagonMap.CellType.Empty,
                position    = Vector3.zero,
            };

            _map.SetCell(columnIndex, rowIndex, HexagonMap.CellType.Gem, assetIndex);
            _map.ClearCell(columnIndex, rowIndex);

            Assert.AreEqual(cell, _map.GetCell(columnIndex, rowIndex));
        }