public function testHaveSingleSourceLanguage()
{
$this->setMwGlobals(array('wgTranslateGroupFiles' => array(__DIR__ . '/data/MixedSourceLanguageGroups.yaml')));
MessageGroups::singleton()->recache();
$enGroup1 = MessageGroups::getGroup('EnglishGroup1');
$enGroup2 = MessageGroups::getGroup('EnglishGroup2');
$teGroup1 = MessageGroups::getGroup('TeluguGroup1');
$this->assertEquals('en', MessageGroups::haveSingleSourceLanguage(array($enGroup1, $enGroup2)));
$this->assertEquals('', MessageGroups::haveSingleSourceLanguage(array($enGroup1, $enGroup2, $teGroup1)));
}
