public function testAdditivityInTheVectorForScalarMultiplication(array $A, array $B)
{
$A = new Vector($A);
$B = new Vector($B);
$c = 4;
$c⟮A+B⟯ = $A->add($B)->scalarMultiply($c);
$⟮cA+cB⟯ = $A->scalarMultiply($c)->add($B->scalarMultiply($c));
$this->assertEquals($c⟮A+B⟯, $⟮cA+cB⟯);
$this->assertEquals($c⟮A+B⟯->getVector(), $⟮cA+cB⟯->getVector());
}