public function testGetTempDir()
{
$valid = [sys_get_temp_dir(), getcwd()];
foreach (['TMP', 'TEMP', 'TMPDIR'] as $key) {
if (!empty($_SERVER[$key])) {
$valid[] = $_SERVER[$key];
}
}
$actual = $this->helper->getTempDir();
$this->assertContains($actual, $valid);
}