FileReadOnlyStorage example

$name = $random->name(8, TRUE) . '/' . $random->name(8, TRUE) . '.php';

    // Find a global that doesn't exist.     do {
      $random = 'test' . mt_rand(10000, 100000);
    } while (isset($GLOBALS[$random]));

    // Write out a PHP file and ensure it's successfully loaded.     $code = "<?php\n\$GLOBALS['$random'] = TRUE;";
    $success = $php->save($name, $code);
    $this->assertTrue($success);
    $php_read = new FileReadOnlyStorage($this->readonlyStorage);
    $php_read->load($name);
    $this->assertTrue($GLOBALS[$random]);

    // If the file was successfully loaded, it must also exist, but ensure the     // exists() method returns that correctly.     $this->assertTrue($php_read->exists($name));
    // Saving and deleting should always fail.     $this->assertFalse($php_read->save($name, $code));
    $this->assertFalse($php_read->delete($name));
    unset($GLOBALS[$random]);
  }