public function testSpliceColumns()
{
$matrix = new Matrix([[1, -1, 2], [4, 0, 6], [0, 1, -1]]);
$spliced = $matrix->spliceColumns(1, 1, [[8], [5], [2]]);
static::assertEquals(1, $spliced->get(0, 0));
static::assertEquals(8, $spliced->get(0, 1));
static::assertEquals(2, $spliced->get(0, 2));
static::assertEquals(4, $spliced->get(1, 0));
static::assertEquals(5, $spliced->get(1, 1));
static::assertEquals(6, $spliced->get(1, 2));
static::assertEquals(0, $spliced->get(2, 0));
static::assertEquals(2, $spliced->get(2, 1));
static::assertEquals(-1, $spliced->get(2, 2));
}