@Test
  public void testRemoveNamespaceOwnership() throws TException, IOException {
    removeNamespaceOwnershipAndVerify(
        "remove_individual_ownership",
        ImmutableMap.of(HiveCatalog.HMS_DB_OWNER, "some_owner"),
        ImmutableSet.of(HiveCatalog.HMS_DB_OWNER, HiveCatalog.HMS_DB_OWNER_TYPE),
        "some_owner",
        PrincipalType.USER,
        UserGroupInformation.getCurrentUser().getShortUserName(),
        PrincipalType.USER);

    removeNamespaceOwnershipAndVerify(
        "remove_group_ownership",
        ImmutableMap.of(
            HiveCatalog.HMS_DB_OWNER,
            "some_group_owner",
            HiveCatalog.HMS_DB_OWNER_TYPE,
            PrincipalType.GROUP.name()),
        ImmutableSet.of(HiveCatalog.HMS_DB_OWNER, HiveCatalog.HMS_DB_OWNER_TYPE),
        "some_group_owner",
        PrincipalType.GROUP,
        UserGroupInformation.getCurrentUser().getShortUserName(),
        PrincipalType.USER);

    removeNamespaceOwnershipAndVerify(
        "remove_ownership_on_default_noop_1",
        ImmutableMap.of(),
        ImmutableSet.of(HiveCatalog.HMS_DB_OWNER, HiveCatalog.HMS_DB_OWNER_TYPE),
        UserGroupInformation.getCurrentUser().getShortUserName(),
        PrincipalType.USER,
        UserGroupInformation.getCurrentUser().getShortUserName(),
        PrincipalType.USER);

    removeNamespaceOwnershipAndVerify(
        "remove_ownership_on_default_noop_2",
        ImmutableMap.of(),
        ImmutableSet.of(),
        UserGroupInformation.getCurrentUser().getShortUserName(),
        PrincipalType.USER,
        UserGroupInformation.getCurrentUser().getShortUserName(),
        PrincipalType.USER);

    removeNamespaceOwnershipAndVerify(
        "remove_ownership_noop_1",
        ImmutableMap.of(HiveCatalog.HMS_DB_OWNER, "some_owner"),
        ImmutableSet.of(),
        "some_owner",
        PrincipalType.USER,
        "some_owner",
        PrincipalType.USER);

    removeNamespaceOwnershipAndVerify(
        "remove_ownership_noop_2",
        ImmutableMap.of(
            HiveCatalog.HMS_DB_OWNER,
            "some_group_owner",
            HiveCatalog.HMS_DB_OWNER_TYPE,
            PrincipalType.GROUP.name()),
        ImmutableSet.of(),
        "some_group_owner",
        PrincipalType.GROUP,
        "some_group_owner",
        PrincipalType.GROUP);

    assertThatThrownBy(
        () ->
            removeNamespaceOwnershipAndVerify(
                "remove_owner_without_removing_owner_type",
                ImmutableMap.of(
                    HiveCatalog.HMS_DB_OWNER,
                    "some_individual_owner",
                    HiveCatalog.HMS_DB_OWNER_TYPE,
                    PrincipalType.USER.name()),
                ImmutableSet.of(HiveCatalog.HMS_DB_OWNER),
                "some_individual_owner",
                PrincipalType.USER,
                "no_post_remove_expectation_due_to_exception_thrown",
                null))
        .isInstanceOf(IllegalArgumentException.class)
        .hasMessage(
            String.format(
                "Removing %s and %s has to be performed together or not at all",
                HiveCatalog.HMS_DB_OWNER_TYPE, HiveCatalog.HMS_DB_OWNER));

    assertThatThrownBy(
        () ->
            removeNamespaceOwnershipAndVerify(
                "remove_owner_type_without_removing_owner",
                ImmutableMap.of(
                    HiveCatalog.HMS_DB_OWNER,
                    "some_group_owner",
                    HiveCatalog.HMS_DB_OWNER_TYPE,
                    PrincipalType.GROUP.name()),
                ImmutableSet.of(HiveCatalog.HMS_DB_OWNER_TYPE),
                "some_group_owner",
                PrincipalType.GROUP,
                "no_post_remove_expectation_due_to_exception_thrown",
                null))
        .isInstanceOf(IllegalArgumentException.class)
        .hasMessage(
            String.format(
                "Removing %s and %s has to be performed together or not at all",
                HiveCatalog.HMS_DB_OWNER_TYPE, HiveCatalog.HMS_DB_OWNER));
  }
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