public void Constructor_PassedListOfKnownAndUnknownSquares_NeverSetsAnyWhiteSquares()
        {
            var partiallyComplete = new PartiallyCompleteGroup(2, "1.");
            var initialWhiteBits = partiallyComplete.GetWhiteSquares();

            Assert.That(initialWhiteBits.Count, Is.EqualTo(0));
        }