PayPal\Auth\PPCertificateCredential::getUserName PHP Méthode

    public function getUserName()
    {
        return $this->userName;
    }

 /**
  * @test
  */
 public function testGetUserName()
 {
     $this->assertEquals('platfo_1255077030_biz_api1.gmail.com', $this->credential->getUserName());
 }