@Test
  public void testSetNamespaceOwnershipNoop() throws TException, IOException {
    setNamespaceOwnershipAndVerify(
        "set_ownership_noop_1",
        ImmutableMap.of(HiveCatalog.HMS_DB_OWNER, "some_individual_owner"),
        ImmutableMap.of(
            HiveCatalog.HMS_DB_OWNER,
            "some_individual_owner",
            HiveCatalog.HMS_DB_OWNER_TYPE,
            PrincipalType.USER.name()),
        "some_individual_owner",
        PrincipalType.USER,
        "some_individual_owner",
        PrincipalType.USER);

    setNamespaceOwnershipAndVerify(
        "set_ownership_noop_2",
        ImmutableMap.of(
            HiveCatalog.HMS_DB_OWNER,
            "some_group_owner",
            HiveCatalog.HMS_DB_OWNER_TYPE,
            PrincipalType.GROUP.name()),
        ImmutableMap.of(
            HiveCatalog.HMS_DB_OWNER,
            "some_group_owner",
            HiveCatalog.HMS_DB_OWNER_TYPE,
            PrincipalType.GROUP.name()),
        "some_group_owner",
        PrincipalType.GROUP,
        "some_group_owner",
        PrincipalType.GROUP);

    setNamespaceOwnershipAndVerify(
        "set_ownership_noop_3",
        ImmutableMap.of(),
        ImmutableMap.of(),
        UserGroupInformation.getCurrentUser().getShortUserName(),
        PrincipalType.USER,
        UserGroupInformation.getCurrentUser().getShortUserName(),
        PrincipalType.USER);

    setNamespaceOwnershipAndVerify(
        "set_ownership_noop_4",
        ImmutableMap.of(
            HiveCatalog.HMS_DB_OWNER,
            "some_group_owner",
            HiveCatalog.HMS_DB_OWNER_TYPE,
            PrincipalType.GROUP.name()),
        ImmutableMap.of("unrelated_prop_1", "value_1", "unrelated_prop_2", "value_2"),
        "some_group_owner",
        PrincipalType.GROUP,
        "some_group_owner",
        PrincipalType.GROUP);
  }
Run all the tests from abstract of {@link CatalogTests} with few specific tests related to HIVE.
iceberg/iceberg-catalog/src/test/java/org/apache/iceberg/hive/TestHiveCatalog.java