    public function testGetTransactionIdNull()
    {
        $this->response = m::mock('\Omnipay\Common\Message\AbstractResponseTest_MockRedirectResponse')->makePartial();
        $this->assertNull($this->response->getTransactionId());
    }
The software constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.