Moontoast\Math\BigNumberTest::testAdd PHP Method

    public function testAdd()
    {
        $bn = new BigNumber(2147483647);
        $this->assertSame($bn, $bn->add('9223372036854775808'));
        $this->assertSame('9223372039002259455', $bn->getValue());
        $bn->setScale(3);
        $this->assertSame('9223372039002259457.250', $bn->add(2.25)->getValue());
    }