public function testCanAddMultipleCustomVariablesToTracker()
{
$tracker = new Tracker(123);
$variable1 = new CustomVariable(1, 'var1', 'value1');
$variable2 = new CustomVariable(2, 'var2', 'value2');
$tracker->addCustomVariable($variable1);
$tracker->addCustomVariable($variable2);
$this->assertCount(2, $tracker->getCustomVariables());
}
