MathPHP\SetTheory\ImmutableSetTest::testAddMultiDoesNothing PHP Метод

    public function testAddMultiDoesNothing()
    {
        $A = new ImmutableSet([1, 2, 3, 4]);
        $B = $A->copy();
        $A->addMulti([5]);
        $A->addMulti([6, 7, 8]);
        $A->addMulti([7, 8, 9]);
        $A->addMulti([new Set(['a', 'b'])]);
        $this->assertEquals($B, $A);
        $this->assertEquals($B->asArray(), $A->asArray());
    }