CODEWITHSUNDEEP
javaunit-testingcollections
Roshan Upreti
Roshan Upreti

Reputation: 2052

using assertions in an unordered collection

I'm inserting a Collection<Event> inside a table, something like this

Collection<Event> eventCollection = service.insert(events);

Now, I need to test that Events in eventCollection has certain attributes. I'm not sure about the order, in which, Events are stored in eventCollection. Currently, this is how I'm doing the assertions.

assertTrue(
        Iterables.get(eventCollection, 0).getPojo.getField1()
            .equals("Some Value") &&
            Iterables.get(eventCollection, 0).getPojo.getField2()
            .equals("Some Value") &&
            Iterables.get(eventCollection, 0).getPojo.getField3()
            .equals("Some Value") &&                
            Iterables.get(eventCollection, 1).getPojo.getField1()
            .equals("Some Value") &&
            eventCollection, 1).getPojo.getField2()
            .equals("Some Value") &&
            Iterables.get(eventCollection, 1).getPojo.getField3()
            .equals("Some Value"))
    );

I know that there are two elements in eventCollection, but I'm not sure what order they're in. Iterables.get seem to work fine, but I'm wondering if there's any easier/shorter way to do this using stream api?

Edit: "Some Value" doesn't always necessarily refer to String.

Upvotes: 1

Views: 73

Answers (1)

user11595728
user11595728

Reputation:

For maximum clarity I would suggest encapsulating the low-level predicate into a helper method, and using Stream.allMatch to do the check.

Helper function (assumed placed in class Context, exact location does not matter):

public static boolean expectedValues(Event event) {
    return event.getPojo().getField1().equals("Some Value") &&
            event.getPojo().getField2().equals("Some Value") &&
            event.getPojo().getField3().equals("Some Value");
}

The actual check, which is indeed much more self-explanatory:

assertTrue(eventCollection.stream().allMatch(Context::expectedValues));

Upvotes: 1

Related Questions