public function testAddScalar()
{
$matrix = new Matrix([[4, 2, 6], [1, 7, 3], [7, 3, 2]]);
$added = $matrix->addScalar(4);
static::assertEquals(8, $added->get(0, 0));
static::assertEquals(6, $added->get(0, 1));
static::assertEquals(10, $added->get(0, 2));
static::assertEquals(5, $added->get(1, 0));
static::assertEquals(11, $added->get(1, 1));
static::assertEquals(7, $added->get(1, 2));
static::assertEquals(11, $added->get(2, 0));
static::assertEquals(7, $added->get(2, 1));
static::assertEquals(6, $added->get(2, 2));
}