This list is updated continuously by the tracker and read by other services such as RewardsService, causing ConcurrentModificationException. This list is now :
private List<VisitedLocation> visitedLocations = new CopyOnWriteArrayList<>();

Correction done:
if(userRewards.stream()
				.filter(ur -> ur.attraction.attractionName.equals(userReward.attraction.attractionName))
				.toList().isEmpty())
Now check thatthe list is empty and not the stream

Implementation of TourGuideService::getNearByAttractions: all attraction locations are compared to user location. Return five closest attractions to user with given reward points.

RewardsService::getRewardPoints is now a public method instead of private because used in TourGuideService::getNearByAttractions

… to 10 but the api return a list with a size of 5.

Tests update to handle asynchronicity

…rease intrinsic speed

…a CompletableFuture .get() to improve quality of test

…a CompletableFuture .get() to improve quality of test