<?php
class FileTest extends \PHPUnit_Framework_TestCase {

  private
    $cache,
    $virtualFileSystemPath,
    $vfs;


  public function setup()
  {
    $this->virtualFileSystemPath = 'vfs';
    $this->vfs = vfsStream::setup($this->virtualFileSystemPath);
    $this->cache = new Cache;
  }

  public function testSetUsesKeyAsFileNameToPersistCacheIn()
  {
    $file = vfsStream::url($this->virtualFileSystemPath . '/testFile');
    $this->cache->set($file, 'dummyValue');
    $this->assertTrue(
      $this->vfs->hasChild('testFile')
    );
  }

  public function testSetUsesValueAsFileContentToPersistCacheIn()
  {
    $file = vfsStream::url($this->virtualFileSystemPath . '/testFile');
    $this->cache->set($file, ['GET', '/']);
    $this->assertSame(
      "<?php return array (\n  0 => 'GET',\n  1 => '/',\n);",
      file_get_contents($file)
    );
  }