public Set<ContentPackInstallation> loadAll() {
        try (final DBCursor<ContentPackInstallation> installations = dbCollection.find()) {
            return ImmutableSet.copyOf((Iterator<ContentPackInstallation>) installations);
        }
    }
@Test
    @MongoDBFixtures("ContentPackInstallationPersistenceServiceTest.json")
    public void loadAll() {
        final Set<ContentPackInstallation> contentPacks = persistenceService.loadAll();
        assertThat(contentPacks).hasSize(4);
    }