public function testHasPassphrase()
{
$ret = SSHKey::hasPassphrase(file_get_contents(__DIR__ . "/../../keys/id_rsa_nopass"));
$this->assertEquals(false, $ret);
$ret = SSHKey::hasPassphrase(file_get_contents(__DIR__ . "/../../keys/id_rsa_pass"));
$this->assertEquals(true, $ret);
}