@Override
    public MetadataRequest.Builder buildRequest(Set<BrokerKey> keys) {
        validateLookupKeys(keys);
        // Send empty `Metadata` request. We are only interested in the brokers from the response
        return new MetadataRequest.Builder(new MetadataRequestData());
    }
@Test
    public void testBuildRequest() {
        AllBrokersStrategy strategy = new AllBrokersStrategy(logContext);
        MetadataRequest.Builder builder = strategy.buildRequest(AllBrokersStrategy.LOOKUP_KEYS);
        assertEquals(Collections.emptyList(), builder.topics());
    }