public void TestIndicesInSquare(int square, int[] expectedIndices)
{
List <int> actualIndicesInSquare = GridMath.GetIndicesInSquare(square);
actualIndicesInSquare.Should().NotBeEmpty()
.And.HaveCount(GridMath.CellsInSquare);
foreach (int expectedIndex in expectedIndices)
{
actualIndicesInSquare.Should().Contain(expectedIndex);
}
}