public void TestBiggestBlackSquareLength()
{
int[] A = new int[] { 1, 2, 5, 3, 1, 3 };
int expected = 2;
int actual = Lessons.BiggestBlackSquareLength(A);
Assert.AreEqual(expected, actual);
A = new int[] { 3, 3, 3, 5, 4 };
expected = 3;
actual = Lessons.BiggestBlackSquareLength(A);
Assert.AreEqual(expected, actual);
A = new int[] { 6, 5, 5, 6, 2, 2 };
expected = 4;
actual = Lessons.BiggestBlackSquareLength(A);
Assert.AreEqual(expected, actual);
}