/**
     * @test
     */
    public function it_should_return_null_if_no_header_found()
    {
        $file = '<?php

$some = "PHP Code here"; // No header at all!

?>
<div class="component Hello-World" <?= attrs($__attrs) ?>>
  <h1>Hello<br/>
      <small>my name is</small>
  </h1>
  <div class="content">
      <?= $__content ?>
  </div>
</div>';
        $resource = fopen('php://memory', 'r+');
        fputs($resource, $file);
        rewind($resource);
        $header = DocComments::getFileHeader($resource);
        $this->assertEquals(null, $header);
        @fclose($resource);
    }
 /**
  * Initialize parameters array with reflection info.
  * Detect if there is $__content parameter -> is container
  * Detect if there is $__attrs parameter -> allow extra attributes
  */
 protected function initialize()
 {
     $header = DocComments::getFileHeader($this->file);
     $vars = DocComments::getVars($header);
     $parameters = [];
     foreach ($vars as $name => $type) {
         if ($name === '__attrs') {
             $this->allowExtraParams = true;
         } elseif ($name === '__content') {
             $this->isContainer = true;
         } else {
             $parameters[$name] = $this->guessParameterDefinition($name, $type);
         }
     }
     $this->parameters = $parameters;
 }