t.Fatalf("Blog should has three tags after Replace")
	}

	// Delete
	DB.Model(&blog).Association("Tags").Delete(tag5)
	var tags3 []Tag
	DB.Model(&blog).Association("Tags").Find(&tags3)
	if !compareTags(tags3, []string{"tag6"}) {
		t.Fatalf("Should find 1 tags after Delete")
	}

	if DB.Model(&blog).Association("Tags").Count() != 1 {
		t.Fatalf("Blog should has three tags after Delete")
	}

        transformer.putResultDataBody(dataMap, "tags", "tag1");

        // Second addition with array
        String[] tags2 = new String[] { "tag2", "tag3" };
        transformer.putResultDataBody(dataMap, "tags", tags2);

        // Third addition with another array
        String[] tags3 = new String[] { "tag4", "tag5" };
        transformer.putResultDataBody(dataMap, "tags", tags3);

        Object result = dataMap.get("tags");

 */
internal sealed class Tags {
  /**
   * Returns a tags instance that maps [key] to [value]. If [value] is null, this returns a tags
   * instance that does not have any mapping for [key].
   */
  abstract fun <T : Any> plus(
    key: KClass<T>,
    value: T?,
  ): Tags

  abstract operator fun <T : Any> get(key: KClass<T>): T?
}

/** An empty tags. This is always the tail of a [LinkedTags] chain. */

        String[] tags1 = { "tag1", "tag2" };
        String[] tags2 = { "tag2", "tag1" };
        String[] roles = { "role1" };
        String[] fields = { "field1" };
        String[] excludes = { "exclude1" };

        String result1 = popularWordHelper.getCacheKey(seed, tags1, roles, fields, excludes);
        String result2 = popularWordHelper.getCacheKey(seed, tags2, roles, fields, excludes);

        String[] fields = { "field1", "field2" };
        item.setFields(fields);
        assertArrayEquals(fields, item.getFields());

        // Test tags
        String[] tags = { "tag1", "tag2" };
        item.setTags(tags);
        assertArrayEquals(tags, item.getTags());

        // Test roles
        String[] roles = { "admin", "user" };
        item.setRoles(roles);

        String[][] readings1 = { { "test" } };
        String[] tags1 = { "tag1", "tag2" };
        String[] roles1 = { "role1" };
        SuggestItem item1 = new SuggestItem(text1, readings1, null, 10L, 20L, 1.0f, tags1, roles1, null, SuggestItem.Kind.QUERY);

        String[] text2 = { "test" };
        String[][] readings2 = { { "test" } };
        String[] tags2 = { "tag2", "tag3" }; // tag2 overlaps

        readings2[1] = new String[] { "kensaku", "fuga" };
        String[] tags2 = new String[] { "tag3" };
        String[] roles2 = new String[] { SuggestConstants.DEFAULT_ROLE, "role4" };
        queryItems[1] = new SuggestItem(new String[] { "全文", "検索" }, readings2, new String[] { "content" }, 1, 0, -1, tags2, roles2, null,
                SuggestItem.Kind.DOCUMENT);

    @Test
    public void test_parse() {
        PrunedTag[] tags = PrunedTag.parse("");
        assertEquals(0, tags.length);

        tags = PrunedTag.parse("a");
        assertEquals(1, tags.length);
        assertEquals("PrunedTag [tag=a, id=null, css=null, attrName=null, attrValue=null]", tags[0].toString());

        tags = PrunedTag.parse("a#test");
        assertEquals(1, tags.length);

        .plus(Boolean::class, null)
    assertThat(tags).isEqualTo(EmptyTags)
    assertThat(tags.toString()).isEqualTo("{}")
  }

  @Test
  fun removeAbsentFromEmpty() {
    val tags = EmptyTags.plus(String::class, null)
    assertThat(tags).isEqualTo(EmptyTags)
    assertThat(tags.toString()).isEqualTo("{}")
  }

  @Test
  fun removeAbsentFromNonEmpty() {
    val tags =
      EmptyTags

        List<String> fields = new ArrayList<>();
        fields.add("field1");
        List<String> tags = new ArrayList<>();
        tags.add("tag1");
        List<String> roles = new ArrayList<>();
        roles.add("role1");

        elevateWord = new ElevateWord(word, boost, readings, fields, tags, roles);

        // Check that we get the same references
        assertTrue(readings == elevateWord.getReadings());