assertTrue(item1.equals(item1));

        // Same input value (id doesn't matter)
        assertTrue(item1.equals(item2));
        assertTrue(item1.equals(item3));

        // Different input value
        assertFalse(item1.equals(item4));

        // Null and different class
        assertFalse(item1.equals(null));
        assertFalse(item1.equals("string"));
        assertFalse(item1.equals(new Object()));
    }

        ProtwordsItem item4 = new ProtwordsItem(1, "word");

        // Same object
        assertTrue(item1.equals(item1));

        // Same input, different id
        assertTrue(item1.equals(item2));

        // Different input
        assertFalse(item1.equals(item3));

        // Same id and input
        assertTrue(item1.equals(item4));

        CharMappingItem item4 = new CharMappingItem(4L, inputs1, "different");

        // Test reflexivity
        assertTrue(item1.equals(item1));

        // Test symmetry and arrays with different order
        assertTrue(item1.equals(item2));
        assertTrue(item2.equals(item1));

        // Test with different inputs
        assertFalse(item1.equals(item3));

    public void test_evaluate_withArrayParameter() {
        String template = "Items: ${items}";
        Map<String, Object> paramMap = new HashMap<>();
        String[] items = { "item1", "item2", "item3" };
        paramMap.put("items", items);

        Object result = scriptEngine.evaluate(template, paramMap);
        assertTrue(result.toString().contains("item1"));
    }

    // Test evaluate method returns different object type

        assertEquals(2, result.size());

        CharMappingItem item1 = result.get(0);
        assertArrayEquals(new String[] { "α", "β" }, item1.getInputs());
        assertEquals("γ", item1.getOutput());

        CharMappingItem item2 = result.get(1);
        assertArrayEquals(new String[] { "中", "文" }, item2.getInputs());
        assertEquals("字", item2.getOutput());
    }

    // Test with very long input line

        assertArrayEquals(languages, item.getLanguages());
        assertEquals(1, item.getKinds().length);
        assertEquals(SuggestItem.Kind.QUERY, item.getKinds()[0]);
        assertEquals(50L, item.getQueryFreq());
        assertEquals(100L, item.getDocFreq());
        assertEquals(1.5f, item.getUserBoost(), 0.001f);
        assertNotNull(item.getTimestamp());
        assertNotNull(item.getId());
    }

    @Test

    }

    /**
     * Merges two suggest items.
     * @param item1 The first suggest item.
     * @param item2 The second suggest item.
     * @return The merged suggest item.
     */
    public static SuggestItem merge(final SuggestItem item1, final SuggestItem item2) {
        if (!item1.getId().equals(item2.getId())) {
            throw new IllegalArgumentException("Item id is mismatch.");
        }

        // Test getting non-existing item
        OptionalEntity<ProtwordsItem> item = protwordsFile.get(999);
        assertFalse(item.isPresent());
    }

    public void test_get_withUnloadedData() {
        // Test getting item when data is not loaded yet
        OptionalEntity<ProtwordsItem> item = protwordsFile.get(1);
        assertTrue(item.isPresent());
        assertEquals("test1", item.get().getInput());
    }

            items.add(new SuggestItem(new String[] { "マルチワード" + i, "fuga" }, readings, new String[] { "content" }, 0, 15 + i, -1, tags,
                    roles, null, SuggestItem.Kind.QUERY));
        }

        return items.toArray(new SuggestItem[items.size()]);
    }

    private SuggestItem[] getItemSet2() {
        List<SuggestItem> items = new ArrayList<>();

        {

    }

    public void test_getLanguageItems() {
        final List<Map<String, String>> enItems = systemHelper.getLanguageItems(Locale.ENGLISH);
        assertEquals(55, enItems.size());
        final List<Map<String, String>> jaItems = systemHelper.getLanguageItems(Locale.JAPANESE);
        assertEquals(55, jaItems.size());
    }

    public void test_getHostnamet() {
        assertNotNull(systemHelper.getHostname());