return ImmutableMap.of(key, value);
  }

  @Empty
  static <K, V> ConcurrentMap<K, V> generateConcurrentMap() {
    return Maps.newConcurrentMap();
  }

  @Generates
  static <K, V> ConcurrentMap<K, V> generateConcurrentMap(K key, V value) {
    ConcurrentMap<K, V> map = Maps.newConcurrentMap();
    map.put(key, value);
    return map;
  }

  @Generates

    return ImmutableMap.of(key, value);
  }

  @Empty
  static <K, V> ConcurrentMap<K, V> generateConcurrentMap() {
    return Maps.newConcurrentMap();
  }

  @Generates
  static <K, V> ConcurrentMap<K, V> generateConcurrentMap(K key, V value) {
    ConcurrentMap<K, V> map = Maps.newConcurrentMap();
    map.put(key, value);
    return map;
  }

  @Generates