public void Contains_WhenRowNotExists_ShouldReturnFalse()
{
var matrix = new Matrix <int>(new int[][]
{
new int [] { 0, 1, 2, 3 },
new int [] { 1, -2, 3, 10 }
});
var collection = new RowCollection <int>(matrix);
Assert.False(collection.Contains(new int[] { 0, 1, 2, 4 }));
Assert.False(collection.Contains(null));
}