public function testStdErrStream()
 {
     $out = new StdErr();
     $stream = $out->getDefaultOutputStream()->getStream();
     $this->assertSame(get_resource_type($stream), 'stream');
 }
 /**
  * @param string  $message
  * @param mixed[] ...$replacements
  */
 protected function writeErrorLine($message, ...$replacements)
 {
     $this->stdErr->writeLine(sprintf('[ERROR] %s', $message), ...$replacements);
 }