/**
* verifies a {@link VectorAndPrefsWritable}
*/
private static VectorAndPrefsWritable vectorAndPrefsWritableMatches(final List<Long> userIDs,
final List<Float> prefValues, final Vector.Element... elements) {
EasyMock.reportMatcher(new IArgumentMatcher() {
@Override
public boolean matches(Object argument) {
if (argument instanceof VectorAndPrefsWritable) {
VectorAndPrefsWritable vectorAndPrefs = ((VectorAndPrefsWritable) argument);