assertEquals(SuggestItem.Kind.DOCUMENT, item.getKinds()[0]);
        assertNotNull(item.getTimestamp());
    }

    @Test
    public void testMerge() {
        // Test merge static method
        String[] text1 = { "item1" };
        String[][] readings1 = { { "read1" } };
        String[] tags1 = { "tag1" };
        String[] roles1 = { "role1" };
        String[] languages1 = { "en" };

                    continue;
                }

                final String item2Id = item2.getId();
                if (item1Id.equals(item2Id)) {
                    mergedItem = SuggestItem.merge(mergedItem, item2);
                    mergedIdSet.add(item1Id);
                }
            }
            mergedList.add(mergedItem);
        }

    /**
     * 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.");
        }