Kraken\Util\Buffer\BufferInterface::pop PHP Method

    public function pop($length);

 public function testApiPop_ReturnsEmptyString_WhenInvalidLengthIsPassed()
 {
     $length = -1;
     $result = $this->buffer->pop($length);
     $this->assertSame('', $result);
     $this->assertSame($this->initialString, (string) $this->buffer);
 }