public function testGetOsIdentifier()
{
$possibleValues = array('CYG', 'DAR', 'FRE', 'HP-', 'IRI', 'LIN', 'Net', 'OPE', 'SUN', 'UNI', 'WIN');
$osIdentifier = $this->service->getOsIdentifier();
$this->assertEquals(3, strlen($osIdentifier));
$this->assertTrue(ctype_upper($osIdentifier));
$this->assertContains($osIdentifier, $possibleValues);
}