/**
  * @depends testCreate
  */
 public function testGetWechatSignature()
 {
     $chargeForm = new ChargeForm();
     $chargeForm->load(require 'data/wechat-charge.php', '');
     $this->assertTrue($chargeForm->validate() && $chargeForm->create(), 'Create wechat charge');
     $signature = $chargeForm->getWechatSignature(null, 'https://m.idarex.com');
     $this->assertNotEmpty($signature, 'Signature can not be empty');
 }