* example, the code:
   *
   * <pre>{@code
   * Map<String, Boolean> options =
   *     ImmutableMap.of("verbose", true, "sort", false);
   * EntryTransformer<String, Boolean, String> flagPrefixer =
   *     new EntryTransformer<String, Boolean, String>() {
   *       public String transformEntry(String key, Boolean value) {
   *         return value ? key : "no" + key;
   *       }
   *     };

   * example, the code:
   *
   * <pre>{@code
   * Map<String, Boolean> options =
   *     ImmutableMap.of("verbose", true, "sort", false);
   * EntryTransformer<String, Boolean, String> flagPrefixer =
   *     new EntryTransformer<String, Boolean, String>() {
   *       public String transformEntry(String key, Boolean value) {
   *         return value ? key : "no" + key;
   *       }
   *     };

   * For example, the code:
   *
   * <pre>{@code
   * SetMultimap<String, Integer> multimap =
   *     ImmutableSetMultimap.of("a", 1, "a", 4, "b", -6);
   * EntryTransformer<String, Integer, String> transformer =
   *     new EntryTransformer<String, Integer, String>() {
   *       public String transformEntry(String key, Integer value) {
   *          return (value >= 0) ? key : "no" + key;
   *       }
   *     };

          @Override
          public String apply(String value) {
            return Ascii.toLowerCase(value);
          }
        };

    static final EntryTransformer<String, String, String> ENTRY_TRANSFORMER =
        new EntryTransformer<String, String, String>() {
          @Override
          public String transformEntry(String key, String value) {
            return Ascii.toLowerCase(value);
          }

  @GwtIncompatible(value = "untested")
  public void testTransformEntries() {
    SetMultimap<String, Integer> multimap = ImmutableSetMultimap.of("a", 1, "a", 4, "b", -6);
    EntryTransformer<String, Integer, String> transformer =
        new EntryTransformer<String, Integer, String>() {
          @Override
          public String transformEntry(String key, Integer value) {
            return (value >= 0) ? key : "no" + key;
          }

          @Override
          public String apply(String value) {
            return Ascii.toLowerCase(value);
          }
        };

    static final EntryTransformer<String, String, String> ENTRY_TRANSFORMER =
        new EntryTransformer<String, String, String>() {
          @Override
          public String transformEntry(String key, String value) {
            return Ascii.toLowerCase(value);
          }