Moontoast\Math\BigNumberTest::testDecrement PHP Method

    public function testDecrement()
    {
        $bn = new BigNumber('9223372036854775808');
        $this->assertSame($bn, $bn->decrement());
        $this->assertSame('9223372036854775807', $bn->getValue());
        $bn->setScale(4);
        $this->assertSame('9223372036854775806.0000', $bn->decrement()->getValue());
    }