public function testConvertToBase()
{
$bn1 = new BigNumber('9223372036854775807');
$bn2 = new BigNumber('9223372036854775810');
$bn3 = new BigNumber('2');
$this->assertEquals('7fffffffffffffff', $bn1->convertToBase(16));
$this->assertEquals('8000000000000002', $bn2->convertToBase(16));
$this->assertEquals('10', $bn3->convertToBase(2));
$this->assertEquals('1y2p0ij32e8e7', $bn1->convertToBase(36));
}