MathPHP\SetTheory\SetOperationsTest::testAdd PHP Метод

    public function testAdd(array $A, $x, array $R)
    {
        $setA = new Set($A);
        $setR = new Set($R);
        $setA->add($x);
        $this->assertEquals($setR, $setA);
        $this->assertEquals($setR->asArray(), $setA->asArray());
    }