while (set.size() < size) {
      set.add(newElement());
    }
    return set;
  }

  private Element newElement() {
    int value = random.nextInt();
    return isUserTypeFast ? new Element(value) : new SlowElement(value);
  }

  static class Element implements Comparable<Element> {
    final int hash;

    Element(int hash) {
      this.hash = hash;
    }

        //        searchName = Srl.substringFirstRear(classificationName, ".");
        //    } else {
        //        return null;
        //    }
        //}
        //try {
        //    return CDef.DefMeta.valueOf(searchName);
        //} catch (IllegalArgumentException ignored) { // not found
        //    return null; // handled later
        //}
    }

    @Override

        String result = StringUtil.join("-", "", null, "value", "", null);
        // First: "" (sb becomes "")
        // Second: sb.length() is 0, no delimiter, append null (sb becomes "null")
        // Third: sb.length() > 0, add "-" + "value" (sb becomes "null-value")
        // Fourth: sb.length() > 0, add "-" + "" (sb becomes "null-value-")
        // Fifth: sb.length() > 0, add "-" + null (sb becomes "null-value--null")

        try {
            final boolean result = validator.isValid("test", null);
            assertNotNull("isValid should return a boolean result", Boolean.valueOf(result));
        } catch (final NullPointerException e) {
            // This is expected if the implementation requires a non-null context

        final Map<String, Object> requestBody = new HashMap<>();
        final String keyProp = NAME_PREFIX + id;
        requestBody.put(KEY_PROPERTY, keyProp);
        requestBody.put("duplicate_host_name", "duplicate_" + Integer.valueOf(id).toString());
        requestBody.put("sort_order", id);
        return requestBody;
    }

    @Override
    protected Map<String, Object> getUpdateMap() {

        final String keyProp = NAME_PREFIX + id;
        requestBody.put(KEY_PROPERTY, keyProp);
        requestBody.put("query", "query" + id);
        requestBody.put("max_size", Integer.valueOf(id).toString());
        requestBody.put("boost", 100);
        return requestBody;
    }

    @Override
    protected Map<String, Object> getUpdateMap() {

        requestBody.put(KEY_PROPERTY, keyProp);
        requestBody.put("value", Integer.valueOf(id).toString());
        return requestBody;
    }

    @Override
    protected Map<String, Object> getUpdateMap() {
        final Map<String, Object> updateMap = new HashMap<>();
        updateMap.put("value", "newValue");
        return updateMap;
    }

    @Test
    void crudTest() {

        bean.aaa = "1,000";
        final Bean2 bean2 = new Bean2();
        BeanUtil.copyBeanToBean(bean, bean2, converter(new NumberConverter("#,##0")));
        assertThat(bean2.aaa, is(Integer.valueOf(1000)));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testCopyBeanToMap() throws Exception {
        final SrcBean src = new SrcBean();
        src.aaa = "aaa";

        if (crudMode != expectedMode) {
            throwValidationError(messages -> {
                messages.addErrorsCrudInvalidMode(GLOBAL, String.valueOf(expectedMode), String.valueOf(crudMode));
            }, this::asListHtml);
        }
    }

    // ===================================================================================

            throwValidationError(messages -> {
                messages.addErrorsCrudInvalidMode(GLOBAL, String.valueOf(expectedMode), String.valueOf(crudMode));
            }, () -> asListHtml(dictId));
        }
    }

    private static void validateStopwordsString(final String values, final String propertyName, final VaErrorHook hook) {
        // TODO validation
    }