PayU\Configuration::setSecretKey PHP Method

    public function setSecretKey($secretKey)
    {
        $this->secretKey = $secretKey;
        return $this;
    }

 public function testSetSecretKey()
 {
     $this->configuration->setSecretKey('TestSecretKeySetter');
     $this->assertEquals('TestSecretKeySetter', $this->configuration->getSecretKey());
 }