function test_deleteAll()
{
$test_marker = new Marker("Pok Pok", "123 abcd street", 34.343534, 41.89089, "Restaurant");
$new_name = "Whiskey Soda Lounge";
$new_address = "678 DEF street";
$new_lat = 41.89089;
$new_lng = 34.343534;
$new_type = "Bar";
$new_marker = new Marker($new_name, $new_address, $new_lat, $new_lng, $new_type);
Marker::deleteAll();
$this->assertEquals([], Marker::getAll());
}