IntegrationTest.java

IntegrationTest.java

protected abstract static class ListComparer<T> {
	
		protected abstract Comparable compareBy(T item);
		protected boolean equalLists(List<T> result, List<T> expected) {
			if (result == null || expected == null) {
				return result == null && expected == null;
			}

			Comparator<T> comparator = new Comparator<T>() {

				@Override
				public int compare(T o1, T o2) {
					if (o1 == null || o2 == null) {
						if (o1 == null && o2 == null) {
							return 0;
						} else if (o1 == null) {
							return 1;
						} else {
							return -1;
						}
					}
					return compareBy(o1).compareTo(compareBy(o2));
				}
			};

			Collections.sort(result, comparator);
			Collections.sort(expected, comparator);
			Iterator<T> expectedIter = expected.iterator();
			Iterator<T> resultIter = result.iterator();

			T expectedT;
			T resultT;

			while(expectedIter.hasNext()) {
				expectedT = expectedIter.next();
				if (!resultIter.hasNext()) {
					return false;
				}
				resultT = resultIter.next();
				if (compareBy(expectedT).compareTo(compareBy(resultT)) != 0) {
					return false;
				}
			}
			return !resultIter.hasNext();
		}
	}

public boolean equalCourseListsById(Collection<Course> result, Collection<Course> expected) {
        return new CollectionComparer<Course>() {
            protected Comparable compareBy(Course item) {
                return item.getId();
            };
        }.equalLists(result, expected);
    }