public function testGetBtcAmount()
{
$amount = '4.3';
$this->payout->setBtcAmount($amount);
$this->assertSame($this->payout->getBtcAmount(), $amount);
$amount = 4.3;
$this->payout->setBtcAmount($amount);
$this->assertSame($this->payout->getBtcAmount(), $amount);
}