public void GetNearCells()
{
// Arrange
var sut = new MineField(4, 4);
// Act
var ret = sut.GetNearCells(0, 0);
// Assert
ret.Should()
.BeEquivalentTo(new[]
{ sut.Cells[1],
sut.Cells[4],
sut.Cells[5], });
}