public void CheckStraightLineTest()
{
var s = new Solution();
int[][] coordinates;
coordinates = Create2dArray(2, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7);
Assert.True(s.CheckStraightLine(coordinates));
coordinates = Create2dArray(2, 1, 1, 2, 2, 3, 4, 4, 5, 5, 6, 7, 7);
Assert.False(s.CheckStraightLine(coordinates));
}