@Test
public void testCrossVector() {

    Vector v = new Vector(2, 3, 4);
    Matrix m = new Matrix(5, 6, 7, 8, 9, 10);
    Vector shouldBe = new Vector(67, 76, 4);
    
    Vector rslt = v.cross(m);
    Assert.assertEquals(shouldBe, rslt);
}