public Board()
{
for (int i = 0; i < 9; i++)
{
sectors[i] = new Sector();
}
}
static void SectorTests()
{
Sector s = new Sector();
Debug.Assert(s[0] == Sector.UNKNOWN && s[8] == Sector.UNKNOWN, "Incorrect initialization of UNKNOWN values");
Debug.Assert(s.ValidColumn(1), "ValidColumn fails for three UNKNOWNs");
Debug.Assert(s.ValidRow(1), "ValidRow fails for three UNKNOWNs");
s[4] = '4';
Debug.Assert(s[4] == '4', "Sector assignment does not work");
Debug.Assert(s.ValidRow(2), "ValidRow returns false for two UNKNOWN values in a row");
s[5] = '5';
Debug.Assert(s.ValidRow(2), "ValidRow returns false for two unique values in a row");
s[5] = '4';
Debug.Assert(s.ValidRow(2) == false, "ValidRow returns true for two nonunique values in a row");
s[3] = '3';
s[5] = '5';
Debug.Assert(s.ValidRow(2), "ValidRow returns false for three unique values in a row");
Debug.Assert(s.ValidRow(1), "ValidRow works on row 1");
Debug.Assert(s.ValidRow(3), "ValidRow works on row 3");
Debug.Assert(s.ValidColumn(1) && s.ValidColumn(2) && s.ValidColumn(3), "ValidColumn fails with 1 unique value in column");
// Current state:
// . . .
// 3 4 5
// . . .
s[0] = '5';
Debug.Assert(s.ValidColumn(1), "ValidColumn fails with 2 uniques");
s[6] = '5';
Debug.Assert(s.ValidColumn(1) == false, "ValidColumn should return false for two nonunique numbers");
Debug.Assert(s.ValidSector() == false, "ValidSector fails with two repeating numbers in Column 1");
s[6] = '6';
Debug.Assert(s.ValidSector() == false, "ValidSector should return false");
s[0] = '9';
Debug.Assert(s.ValidSector(), "ValidSector should return true");
// Current state:
// 9 . .
// 3 4 5
// 6 . .
Debug.Assert(s.UnusedValues().Count == 4, "UnusedValues doesn't work with 4 missing values");
s[1] = '1';
s[2] = '2';
s[7] = '7';
Debug.Assert(s.UnusedValues().Count == 1, "UnusedValues doesn't work with just 1 missing value");
s[2] = '7';
Debug.Assert(s.UnusedValues().Count == 2, "UnusedValues should ignore invalid sectors");
s[2] = '2';
s[8] = '8';
Debug.Assert(s.UnusedValues().Count == 0, "UnusedValues doesn't work for no values left");
Debug.Assert(s.UsedValues().Count == 9, "UsedValues should return 9 when they are all used");
// Current state:
// 9 1 2
// 3 4 5
// 6 7 8
}