Backend\Modules\Analytics\GoogleClient\Connector::getVisitors PHP Method

    public function getVisitors($startDate, $endDate)
    {
        $results = $this->getData($startDate, $endDate);
        return $results['metrics']['ga:users'];
    }

 public function testGetVisitors()
 {
     $connector = new Connector($this->getAnalyticsServiceMock(), new Pool(new MemoryStore()), $this->getModulesSettingsMock());
     $this->assertEquals(2, $connector->getVisitors(strtotime('-1 day', mktime(0, 0, 0)), mktime(0, 0, 0)));
 }