public function testClearingCacheFiles() {
$name = 'I will be deleted.';
$template = $this->env
->loadTemplate($name);
$cacheFileName = $this->env
->getCacheFilename($name);
$this
->assertTrue(file_exists($cacheFileName), 'Cache file does not exist.');
$this->env
->clearCacheFiles();
$this
->assertFalse(file_exists($cacheFileName), 'Cache file was not cleared.');
}