public function testAddMatrix() { $matrix1 = new Matrix([[1, 2, 3], [4, 5, 6], [7, 8, 9]]); $matrix2 = new Matrix([[4, 2, 6], [1, 7, 3], [7, 3, 2]]); $added = $matrix1->addMatrix($matrix2); static::assertEquals(5, $added->get(0, 0)); static::assertEquals(4, $added->get(0, 1)); static::assertEquals(9, $added->get(0, 2)); static::assertEquals(5, $added->get(1, 0)); static::assertEquals(12, $added->get(1, 1)); static::assertEquals(9, $added->get(1, 2)); static::assertEquals(14, $added->get(2, 0)); static::assertEquals(11, $added->get(2, 1)); static::assertEquals(11, $added->get(2, 2)); }