human
Write a unit test for this function:     public void validateNoDuplicates(List<BillerMethodEntry> newEntries,
        List<BillerMethodEntry> oldEntries)
    {
        if (newEntries.size() < oldEntries.size())
        {
            // user wants to delete an entry, no new duplicates can be created in this case
            return;
        }
        for (BillerMethodEntry newEntry : newEntries)
        {
            if (newEntries.stream().filter(old -> this.equalConfiguration(newEntry, old)).count() > 1)
            {
                throw new IllegalArgumentException(messages.get("duplicate.billing.method.entries"));
            }
        }
    }
gpt
--- Reasoning ---
1. Is the question multiple-choice question?
No
2. Is it implied multiple-choice question?
No
3. If two experts were independently asked the question, will the final answer be exactly the same?
No

--- Answer ---
open