code: public function process( File $phpcsFile, $stackPtr ) {
  
  		$tokens    = $phpcsFile->getTokens();
  		$token     = $tokens[ $stackPtr ];
  		$file_name = basename( $phpcsFile->getFileName() );
  
  		if ( ! isset( $this->file_whitelist[ $file_name ] ) ) {
  			$phpcsFile->addWarning(
  				'Check that %s is not being used to load template files. "get_template_part()" should be used to load template files.',
  				$stackPtr,
  				'FileIncludeFound',
  				array( $token['content'] )
  			);
  		}
  	}
docs: Processes this test, when one of its tokens is encountered.
  
  @param \PHP_CodeSniffer\Files\File $phpcsFile The PHP_CodeSniffer file where the
  token was found.
  @param int                         $stackPtr  The position of the current token
  in the stack.
  
  @return void