public function testMultiplyMatrix() { $matrix1 = new Matrix([[1, 2, 3], [4, 5, 6]]); $matrix2 = new Matrix([[7, 8], [9, 10], [11, 12]]); $multiplied = $matrix1->multiplyMatrix($matrix2); static::assertEquals(58, $multiplied->get(0, 0)); static::assertEquals(64, $multiplied->get(0, 1)); static::assertEquals(139, $multiplied->get(1, 0)); static::assertEquals(154, $multiplied->get(1, 1)); }