@Override
    public Set<String> getBundleLocations(ApplicationId appId) {
        Set<String> locations = localAppBundleDirectory.get(appId);
        return locations != null ? locations : Sets.newHashSet();
    }
@Test
    public void testGetBundleLocations() {
        Set<String> locations = localAppBundleDirectory.get(appId);
        assertTrue(locations.contains("locationA"));
    }