@Test
public void testMultiply() throws Exception{

    Matrix m1 = new Matrix(2, 3, 4, 5, 6, 7);
    Matrix m2 = new Matrix(8, 9, 10, 11, 12, 13);
    Matrix shouldBe = new Matrix(46, 51, 82, 91, 130, 144);
    
    Matrix rslt = m1.multiply(m2);
    Assert.assertEquals(shouldBe, rslt);
}